Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - Narrative (Details)

v3.10.0.1
Long-Term Debt - Narrative (Details) - USD ($)
9 Months Ended
Sep. 30, 2016
Feb. 29, 2016
Sep. 30, 2018
Sep. 27, 2018
Dec. 31, 2017
Debt Instrument [Line Items]          
Long-term debt     $ 1,806,119,000   $ 1,718,297,000
Revolving Credit Facility          
Debt Instrument [Line Items]          
Line of credit     159,100,000    
Remaining borrowing capacity     135,900,000    
Deferred financing and unamortized discounts     $ 24,569,000    
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]          
Derivative, interest rate     7.99%    
Senior Notes 9.125 Percent Due 2020 | Senior Notes          
Debt Instrument [Line Items]          
Principal     $ 585,000,000    
Debt interest rate     9.125%    
Debt issuance costs, net     $ 3,412,000    
Long-term debt     581,588,000   580,026,000
Promissory Note Due 2020 | Promissory Note          
Debt Instrument [Line Items]          
Long-term debt   $ 12,000,000 12,000,000   12,000,000
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   1,078,000,000    
Long-term debt     1,054,933,000   1,059,598,000
Debt discount on purchase price 1.50%        
Line of credit facility, periodic payment     $ 2,750,000    
Springing maturity period     181 days    
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     $ 157,598,000   $ 66,673,000
Maximum borrowing on line $ 295,000,000   $ 295,000,000    
Line of credit       $ 26,691,000  
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%