Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - Narrative (Details)

v3.7.0.1
Long-Term Debt - Narrative (Details) - USD ($)
6 Months Ended
Sep. 30, 2016
Feb. 29, 2016
Jun. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]        
Long-term debt     $ 1,715,322,000 $ 1,698,778,000
Revolving Credit Facility        
Debt Instrument [Line Items]        
Line of credit     63,500,000  
Remaining borrowing capacity     $ 231,500,000  
LIBOR | Revolving Credit Facility        
Debt Instrument [Line Items]        
Commitment fee for line of credit     0.50%  
Principal Owner        
Debt Instrument [Line Items]        
Principal being treated as a capital contribution   $ 88,000,000    
Term Loan | Interest Rate Swap | Designated as Hedging Instrument        
Debt Instrument [Line Items]        
Fixed rate paid     7.18%  
Revolving Credit Facility        
Debt Instrument [Line Items]        
Deferred financing and unamortized discounts     $ 30,961,000  
Senior Notes 9.125 Percent Due 2020 | Senior Notes        
Debt Instrument [Line Items]        
Principal     $ 585,000,000  
Debt interest rate     9.125%  
Accumulated amortization, debt issuance costs     $ 5,967,000  
Long-term debt     579,033,000 578,078,000
Promissory Note Due 2020 | Promissory Note        
Debt Instrument [Line Items]        
Long-term debt   $ 12,000,000 12,000,000 12,000,000 [1]
Promissory Note Due 2020 | Promissory Note | Parent Company        
Debt Instrument [Line Items]        
Debt interest rate   12.50%    
Extinguishment of debt   $ 100,000,000    
Term Loan Due September 2022 | Term Loan        
Debt Instrument [Line Items]        
Principal $ 1,100,000,000   1,091,750,000  
Long-term debt     1,062,822,000 1,066,130,000
Debt discount on purchase price 1.50%      
Line of credit facility, periodic payment     $ 2,750,000  
Term Loan Due September 2022 | Term Loan | LIBOR        
Debt Instrument [Line Items]        
Basis spread on variable debt     5.50%  
Floor on variable debt     1.00%  
Revolving Credit Facility Due 2021 | Revolving Credit Facility        
Debt Instrument [Line Items]        
Long-term debt     $ 61,467,000 $ 42,570,000
Maximum borrowing on line $ 295,000,000   $ 295,000,000  
Revolving Credit Facility Due 2021 | Revolving Credit Facility | LIBOR        
Debt Instrument [Line Items]        
Basis spread on variable debt     4.00%  
Floor on variable debt     1.00%  
[1] The effective rate was 9.868% until February 29, 2016.