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Debt - Additional Information (Details) - USD ($)
1 Months Ended 2 Months Ended 6 Months Ended
Jul. 27, 2016
Aug. 09, 2016
Feb. 29, 2016
Jun. 30, 2016
Dec. 31, 2015
6.875 % Due 2020 [Member]          
Debt Instrument [Line Items]          
Interest rate       6.875%  
6.125% Due 2022 [Member]          
Debt Instrument [Line Items]          
Interest rate       6.125%  
Revolving loans [Member]          
Debt Instrument [Line Items]          
Proceeds from long-term debt     $ 58,000,000    
Repayment of debt       $ 38,000,000  
Available borrowing capacity       83,000,000  
Revolving loans [Member] | Subsequent Event [Member]          
Debt Instrument [Line Items]          
Repayment of debt   $ 16,000,000      
Notes Payable to Banks [Member] | Term Loans [Member]          
Debt Instrument [Line Items]          
Payment of contractual maturities under senior secured credit facilities       $ 10,100,000  
Senior Subordinated Notes [Member] | 5.625 % Due 2024 [Member]          
Debt Instrument [Line Items]          
Frequency of periodic interest payments       semiannually  
Senior Subordinated Notes [Member] | 6.875 % Due 2020 [Member]          
Debt Instrument [Line Items]          
Interest rate       6.875% 6.875%
Senior Subordinated Notes [Member] | 6.125% Due 2022 [Member]          
Debt Instrument [Line Items]          
Interest rate       6.125% 6.125%
Senior Subordinated Notes [Member] | Subsequent Event [Member] | 5.625 % Due 2024 [Member]          
Debt Instrument [Line Items]          
Debt instrument principal amount $ 900,000,000        
Interest rate 5.625%        
Maturity date Aug. 01, 2024        
Prepaid interest $ 5,600,000