Quarterly report pursuant to Section 13 or 15(d)

Debt - Narrative (Details)

v3.19.3
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 ($)
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
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  
Principal Owner                    
Debt Instrument [Line Items]                    
Principal being treated as a capital contribution   $ 88,000,000     $ 2,250,000          
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
Debt instrument, face amount 1,072,500,000           1,072,500,000      
Line of credit facility, periodic payment $ 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
Debt interest rate 9.125%           9.125%     9.125%
Promissory Note, Intercompany | Promissory Note Due October 2020                    
Debt Instrument [Line Items]                    
Long-term debt   $ 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