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Long-Term Debt (Narrative) (Details)
2 Months Ended
Feb. 14, 2013
USD ($)
covenants
Feb. 14, 2013
USD ($)
covenants
Sep. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Feb. 15, 2013
Long Term Debt [Abstract]          
Remaining borrowing capacity     $ 58,800,000    
Letter of credit outstanding     16,200,000    
Refinancing [Abstract]          
Long-term debt     $ 907,034,000 $ 908,641,000  
Repayments of debt   $ 946,500,000      
Interest paid   7,700,000      
Payments of debt issuance costs   32,600,000      
Senior Secured Notes due 2019          
Refinancing [Abstract]          
Debt instrument face amount $ 300,000,000.0 $ 300,000,000.0      
Stated interest rate 8.75% 8.75% 8.75%    
Revolving Credit Facility | Letter of Credit          
Refinancing [Abstract]          
Line of of credit facility oustanding $ 40,000,000.0 $ 40,000,000.0      
Revolving Credit Facility | Line of Credit          
Refinancing [Abstract]          
Line of of credit facility oustanding 75,000,000.0 75,000,000.0      
Term Loan, due 2019 | Notes Payable to Banks          
Refinancing [Abstract]          
Long-term debt 640,000,000.0 640,000,000.0      
Proceeds from line of credit 640,000,000        
Maximum borrowing capacity 200,000,000.0 200,000,000.0      
Senior Secured Notes Due 2019 | Senior Secured Notes due 2019          
Refinancing [Abstract]          
Debt instrument face amount $ 300,000,000.0 $ 300,000,000.0      
Stated interest rate 8.75% 8.75% 8.75%    
Maximum | Revolving Credit Facility | Line of Credit          
Refinancing [Abstract]          
Stated interest rate 5.50% 5.50%      
Maximum | Term Loan, due 2019 | Notes Payable to Banks          
Refinancing [Abstract]          
Stated interest rate 6.25% 6.25%      
Minimum | Revolving Credit Facility | Line of Credit          
Refinancing [Abstract]          
Stated interest rate 4.50% 4.50%      
Fronting fee percent 0.125% 0.125%      
Minimum | Term Loan, due 2019 | Notes Payable to Banks          
Refinancing [Abstract]          
Stated interest rate 5.25% 5.25%      
Federal Funds Effective Rate          
Refinancing [Abstract]          
Point in addition to base interest rate under condition 0.50%        
LIBOR          
Refinancing [Abstract]          
Point in addition to base interest rate under condition 1.00%        
LIBOR | Senior Secured Notes Due 2019 | Term Loan, due 2019          
Refinancing [Abstract]          
Point in addition to base interest rate under condition 1.25%        
Commitment Fee, Period One | Revolving Credit Facility | Line of Credit          
Refinancing [Abstract]          
Percentage commitment fee on average daily unused portion of exit revolving facility 0.50%        
Commitment Fee, Period Two | Revolving Credit Facility | Line of Credit          
Refinancing [Abstract]          
Percentage commitment fee on average daily unused portion of exit revolving facility 0.375%        
Mandatory Repayments, Period One | Senior Secured Notes Due 2019 | Term Loan, due 2019 | Notes Payable to Banks          
Refinancing [Abstract]          
Mandatory repayments as a percent of excess cash flow 50.00% 50.00%      
Mandatory Repayments, Subsequent Periods | Senior Secured Notes Due 2019 | Term Loan, due 2019 | Notes Payable to Banks          
Refinancing [Abstract]          
Mandatory repayments as a percent of excess cash flow 25.00% 25.00%      
Redemption prior to February 15, 2016 | Senior Secured Notes Due 2019 | Senior Secured Notes due 2019          
Refinancing [Abstract]          
Redemption price percent 108.75%        
Default redemption, percent of principal         100.00%
Maximum principal redemption percent         35.00%
Redemption on or after February 15, 2016 and prior to February 15, 2017 | Senior Secured Notes Due 2019 | Senior Secured Notes due 2019          
Refinancing [Abstract]          
Redemption price percent 104.375%        
Redemption on or prior to February 14, 2016 | Senior Secured Notes Due 2019 | Term Loan, due 2019 | Notes Payable to Banks          
Refinancing [Abstract]          
Periodic principal payment $ 1,600,000        
Redemption price percent 101.00%        
Redemption on or after February 15, 2017 and prior to February 15, 2018 | Senior Secured Notes Due 2019 | Senior Secured Notes due 2019          
Refinancing [Abstract]          
Redemption price percent 102.188%        
Consolidated Total Leverage Ratio Covenant | Revolving Credit Facility | Line of Credit          
Refinancing [Abstract]          
Number of restrictive covenants | covenants 2 2