General form of registration statement for all companies including face-amount certificate companies

Debt - Narrative (Details)

v3.19.3.a.u2
Debt - Narrative (Details)
1 Months Ended 3 Months Ended 8 Months Ended 9 Months Ended 12 Months Ended
Aug. 31, 2019
USD ($)
letters_of_credit
Feb. 29, 2016
USD ($)
Sep. 30, 2019
USD ($)
May 20, 2019
Jan. 31, 2019
USD ($)
Mar. 31, 2019
USD ($)
Aug. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Debt Instrument [Line Items]                          
Cash received from equity rights offering $ 150,000,000           $ 150,000,000            
Debt equitization $ 100,000,000           $ 100,000,000            
Long-term debt     $ 994,000,000         $ 994,000,000   $ 1,816,450,000 $ 1,718,297,000    
Senior note exchange, cash option, percentage of principal and accrued unpaid interest due 2.50%           2.50%            
Senior note exchange, noncash option, percentage of common stock issued and outstanding 18.00%           18.00%            
Payments on long-term debt     5,000,000       $ 379,666,000   $ 136,600,000 184,100,000 175,250,000 $ 1,238,059,000  
Principal Owner                          
Debt Instrument [Line Items]                          
Principal being treated as a capital contribution   $ 88,000,000     $ 2,250,000                
Parent Company                          
Debt Instrument [Line Items]                          
Payments on long-term debt                   184,100,000 175,250,000 $ 1,238,059,000  
Revolving Credit Facility                          
Debt Instrument [Line Items]                          
Available for borrowing, amount                   50,200,000      
Letter of Credit                          
Debt Instrument [Line Items]                          
Maximum borrowing, amount                   $ 600,000      
LIBOR | Revolving Credit Facility                          
Debt Instrument [Line Items]                          
Commitment fee on unused portion of line of credit                   0.50%      
Term Loan                          
Debt Instrument [Line Items]                          
Debt reduction of principal amount $ 250,000,000           250,000,000            
Debt instrument, face amount 150,000,000           150,000,000            
Term Loan | Term Loan Due July 2024                          
Debt Instrument [Line Items]                          
Long-term debt     150,000,000         $ 150,000,000          
Maximum borrowing, amount 150,000,000           150,000,000            
Term Loan | Term Loan Due July 2024 | LIBOR                          
Debt Instrument [Line Items]                          
Floor on variable debt               1.50%          
Basis spread on variable debt               5.00%          
Term Loan | Term Loan Due September 2022                          
Debt Instrument [Line Items]                          
Long-term debt                   $ 1,075,250,000 1,059,598,000    
Debt instrument, face amount 1,072,500,000           1,072,500,000     1,075,250,000     $ 1,100,000,000
Line of credit facility, periodic payment $ 2,750,000                 $ 2,750,000      
Additional default interest rate       2.00%                  
Term Loan | Term Loan Due September 2022 | LIBOR                          
Debt Instrument [Line Items]                          
Floor on variable debt 1.00%                 1.00%      
Basis spread on variable debt 5.50%                 5.50%      
Term Loan | Term Loan Due September 2022 | Alternate Base Rate                          
Debt Instrument [Line Items]                          
Basis spread on variable debt           4.50%              
Takeback Loan Facility                          
Debt Instrument [Line Items]                          
Long-term debt $ 822,500,000           822,500,000            
Takeback Loan Facility | Takeback Loan Facility Due March 2024                          
Debt Instrument [Line Items]                          
Long-term debt 822,500,000   822,500,000       822,500,000 $ 822,500,000          
Quarterly principal payments $ 2,056,250                        
Takeback Loan Facility | Takeback Loan Facility Due March 2024 | LIBOR                          
Debt Instrument [Line Items]                          
Floor on variable debt 1.25%             1.25%          
Basis spread on variable debt 6.50%             6.50%          
Takeback Loan Facility | Takeback Loan Facility Due March 2024 | Base Rate                          
Debt Instrument [Line Items]                          
Basis spread on variable debt 5.50%                        
Line of Credit | Revolving Credit Facility                          
Debt Instrument [Line Items]                          
Maximum borrowing, amount $ 145,000,000           145,000,000            
Line of Credit | Swingline Loan                          
Debt Instrument [Line Items]                          
Maximum borrowing, amount 10,000,000           10,000,000            
Line of Credit | Letter of Credit                          
Debt Instrument [Line Items]                          
Maximum borrowing, amount $ 1,000,000           1,000,000            
Number of letters of credit | letters_of_credit 2                        
Line of Credit | Term Loan and Revolving Credit Facility                          
Debt Instrument [Line Items]                          
Maximum borrowing, amount $ 295,000,000           295,000,000            
Line of Credit | Revolving Credit Facility Due July 2024 | Revolving Credit Facility                          
Debt Instrument [Line Items]                          
Long-term debt     $ 21,500,000         $ 21,500,000          
Maximum borrowing, amount 145,000,000           145,000,000            
Available for borrowing, amount $ 123,500,000           123,500,000            
Commitment fee on unused portion of line of credit 0.75%                        
Line of Credit | Revolving Credit Facility Due July 2024 | LIBOR | Revolving Credit Facility                          
Debt Instrument [Line Items]                          
Floor on variable debt 1.50%             1.50%          
Basis spread on variable debt 5.00%             5.00%          
Line of Credit | Revolving Credit Facility Due July 2024 | Base Rate | Revolving Credit Facility                          
Debt Instrument [Line Items]                          
Floor on variable debt 4.50%             4.50%          
Basis spread on variable debt 4.00%             4.00%          
Line of Credit | Revolving Credit Facility Due 2021 | Revolving Credit Facility                          
Debt Instrument [Line Items]                          
Long-term debt $ 181,400,000           $ 181,400,000     $ 144,200,000      
Maximum borrowing, amount           $ 195,000,000       $ 295,000,000      
Commitment fee on unused portion of line of credit 0.50%                        
Additional default interest rate       2.00%                  
Line of Credit | Revolving Credit Facility Due 2021 | LIBOR | Revolving Credit Facility                          
Debt Instrument [Line Items]                          
Floor on variable debt 1.00%                 1.00%      
Basis spread on variable debt 4.00%                 4.00%      
Line of Credit | Revolving Credit Facility Due 2021 | Alternate Base Rate | Revolving Credit Facility                          
Debt Instrument [Line Items]                          
Basis spread on variable debt           3.00%              
Senior Notes                          
Debt Instrument [Line Items]                          
Extinguishment of debt $ 585,000,000                        
Senior Notes | Senior Notes 9.125 Percent Due 2020                          
Debt Instrument [Line Items]                          
Long-term debt                   $ 585,000,000 580,026,000    
Debt interest rate 9.125%           9.125%     9.125%      
Debt instrument, face amount                   $ 585,000,000      
Promissory Note, Intercompany | Promissory Note Due October 2020                          
Debt Instrument [Line Items]                          
Long-term debt   $ 12,000,000               $ 12,000,000 $ 12,000,000    
Payments on long-term debt         $ 9,750,000                
Promissory Note, Intercompany | Promissory Note Due October 2020 | Parent Company                          
Debt Instrument [Line Items]                          
Debt interest rate   12.50%                      
Extinguishment of debt   $ 100,000,000