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Long-Term Debt (Details)
6 Months Ended
Jun. 30, 2016
USD ($)
item
Dec. 31, 2015
USD ($)
Feb. 12, 2013
USD ($)
Aug. 07, 2012
USD ($)
Long-Term Debt        
Long-term debt current and noncurrent $ 689,358,000 $ 687,458,000    
Less: Current portion of long-term debt (5,185,000) (4,867,000)    
Total long-term debt $ 684,173,000 682,591,000    
Ownership interest in existing and certain future owned domestic subsidiaries (as a percent) 100.00%      
Original notes - 7.625%        
Long-Term Debt        
Long-term debt current and noncurrent $ 419,898,000 $ 419,274,000    
Interest rate (as a percent) 7.625% 7.625%   7.625%
Unamortized deferred financing costs $ 5,100,000 $ 5,700,000    
Aggregate outstanding principal amount       $ 425,000,000
Add-on notes - 7.625%        
Long-Term Debt        
Long-term debt current and noncurrent 226,401,000 227,029,000    
Unamortized bond premium $ 8,500,000 $ 9,400,000    
Interest rate (as a percent) 7.625% 7.625% 7.625%  
Unamortized deferred financing costs $ 2,100,000 $ 2,400,000    
Aggregate outstanding principal amount     $ 220,000,000  
Senior secured credit facility        
Long-Term Debt        
Long-term debt current and noncurrent 27,176,000 25,811,000    
Unamortized deferred financing costs 2,000,000 2,200,000    
Maximum borrowing capacity 235,000,000      
Available amount 131,800,000      
Borrowing base 165,500,000      
Borrowing outstanding 29,200,000      
Letters of credit 4,500,000      
Minimum available borrowing capacity required to be maintained for a certain period under financial covenants $ 20,000,000      
Minimum ratio of EBITDA to cash expense, number of quarters | item 4      
Senior secured credit facility | Interest Rate Scenario 1        
Long-Term Debt        
Borrowing outstanding $ 19,000,000      
Debt Instrument, Interest Rate at Period End 2.4471%      
Senior secured credit facility | Interest Rate Scenario 2        
Long-Term Debt        
Borrowing outstanding $ 7,000,000      
Debt Instrument, Interest Rate at Period End 2.4461%      
Senior secured credit facility | Interest Rate Scenario 3        
Long-Term Debt        
Borrowing outstanding $ 3,200,000      
Debt Instrument, Interest Rate at Period End 4.50%      
Capital lease obligations        
Long-Term Debt        
Long-term debt current and noncurrent $ 15,883,000 $ 15,344,000    
Third Amended and Restated Credit Agreement        
Long-Term Debt        
Unused Capacity, Commitment Fee Percentage 0.25%      
Period prior to maturity 90 days      
Third Amended and Restated Credit Agreement | Base Rate | Minimum        
Long-Term Debt        
Margin over base rate (as a percent) 0.50%      
Third Amended and Restated Credit Agreement | Base Rate | Maximum        
Long-Term Debt        
Margin over base rate (as a percent) 1.00%      
Third Amended and Restated Credit Agreement | Adjusted LIBOR | Minimum        
Long-Term Debt        
Margin over base rate (as a percent) 1.50%      
Third Amended and Restated Credit Agreement | Adjusted LIBOR | Maximum        
Long-Term Debt        
Margin over base rate (as a percent) 2.00%