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Long-term Debt (Narrative) (Details)
Feb. 14, 2013
USD ($)
covenant
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Debt Disclosure [Abstract]      
Remaining borrowing capacity   $ 61,100,000  
Letter of credit outstanding   13,900,000  
Schedule of Available-for-sale Securities [Line Items]      
Long-term debt   $ 904,366,000 $ 904,770,000
Repayments of debt $ 946,500,000    
Interest paid 7,700,000    
Payments of debt issuance costs 32,600,000    
Notes, 8.75%, due 2019      
Schedule of Available-for-sale Securities [Line Items]      
Debt instrument face amount $ 300,000,000.0    
Stated interest rate 8.75% 8.75%  
Revolving Credit Facility | Line of Credit      
Schedule of Available-for-sale Securities [Line Items]      
Line of of credit facility outstanding $ 75,000,000.0    
Revolving Credit Facility | Line of Credit | Consolidated Total Leverage Ratio Covenant      
Schedule of Available-for-sale Securities [Line Items]      
Number of restrictive covenants | covenant 2    
Revolving Credit Facility | Letter of Credit      
Schedule of Available-for-sale Securities [Line Items]      
Line of of credit facility outstanding $ 40,000,000.0    
Term Loan, due 2019 (weighted average rate of 7.50%) | Notes Payable to Banks      
Schedule of Available-for-sale Securities [Line Items]      
Long-term debt 640,000,000.0    
Proceeds from line of credit 640,000,000    
Maximum borrowing capacity 200,000,000.0    
Senior Secured Notes Due 2019 | Notes, 8.75%, due 2019      
Schedule of Available-for-sale Securities [Line Items]      
Debt instrument face amount $ 300,000,000.0    
Stated interest rate 8.75% 8.75%  
Senior Secured Notes Due 2019 | Notes, 8.75%, due 2019 | Redemption on or after February 15, 2017 and prior to February 15, 2018      
Schedule of Available-for-sale Securities [Line Items]      
Redemption price percent 102.188%    
Senior Secured Notes Due 2019 | Revolving Credit Facility | Line of Credit | Maximum      
Schedule of Available-for-sale Securities [Line Items]      
Stated interest rate 5.50%    
Senior Secured Notes Due 2019 | Revolving Credit Facility | Line of Credit | Minimum      
Schedule of Available-for-sale Securities [Line Items]      
Stated interest rate 4.50%    
Fronting fee percent 0.125%    
Senior Secured Notes Due 2019 | Revolving Credit Facility | Line of Credit | Commitment Fee, Period One      
Schedule of Available-for-sale Securities [Line Items]      
Percentage commitment fee on average daily unused portion of exit revolving facility 0.50%    
Senior Secured Notes Due 2019 | Revolving Credit Facility | Line of Credit | Commitment Fee, Period Two      
Schedule of Available-for-sale Securities [Line Items]      
Percentage commitment fee on average daily unused portion of exit revolving facility 0.375%    
Senior Secured Notes Due 2019 | Term Loan, due 2019 (weighted average rate of 7.50%) | LIBOR      
Schedule of Available-for-sale Securities [Line Items]      
Point in addition to base interest rate under condition 1.25%    
Senior Secured Notes Due 2019 | Term Loan, due 2019 (weighted average rate of 7.50%) | Base Rate      
Schedule of Available-for-sale Securities [Line Items]      
Point in addition to base interest rate under condition 0.50%    
Senior Secured Notes Due 2019 | Term Loan, due 2019 (weighted average rate of 7.50%) | Notes Payable to Banks | Maximum      
Schedule of Available-for-sale Securities [Line Items]      
Stated interest rate 6.25%    
Senior Secured Notes Due 2019 | Term Loan, due 2019 (weighted average rate of 7.50%) | Notes Payable to Banks | Minimum      
Schedule of Available-for-sale Securities [Line Items]      
Stated interest rate 5.25%    
Senior Secured Notes Due 2019 | Term Loan, due 2019 (weighted average rate of 7.50%) | Notes Payable to Banks | LIBOR      
Schedule of Available-for-sale Securities [Line Items]      
Point in addition to base interest rate under condition 1.00%    
Senior Secured Notes Due 2019 | Term Loan, due 2019 (weighted average rate of 7.50%) | Notes Payable to Banks | Redemption on or prior to February 14, 2016      
Schedule of Available-for-sale Securities [Line Items]      
Periodic principal payment $ 1,600,000    
Senior Secured Notes Due 2019 | Term Loan, due 2019 (weighted average rate of 7.50%) | Notes Payable to Banks | Mandatory Repayments, Period One      
Schedule of Available-for-sale Securities [Line Items]      
Mandatory repayments as a percent of excess cash flow 50.00%    
Senior Secured Notes Due 2019 | Term Loan, due 2019 (weighted average rate of 7.50%) | Notes Payable to Banks | Mandatory Repayments, Subsequent Periods      
Schedule of Available-for-sale Securities [Line Items]      
Mandatory repayments as a percent of excess cash flow 25.00%