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Long-Term Debt (Details)
9 Months Ended
Sep. 30, 2015
USD ($)
item
Dec. 31, 2014
USD ($)
Feb. 12, 2013
USD ($)
Aug. 07, 2012
USD ($)
Jul. 31, 2012
USD ($)
May. 06, 2010
USD ($)
Long-Term Debt            
Long-term debt current and noncurrent $ 706,330,000 $ 710,186,000        
Unamortized bond premium 9,853,000 11,113,000        
Less: Current portion of long-term debt (5,108,000) (5,640,000)        
Total long-term debt $ 701,222,000 704,546,000        
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 $ 425,000,000 $ 425,000,000        
Interest rate (as a percent) 7.625% 7.625%   7.625%    
Aggregate outstanding principal amount       $ 425,000,000    
Add-on notes - 7.625%            
Long-Term Debt            
Long-term debt current and noncurrent $ 220,000,000 $ 220,000,000        
Unamortized bond premium $ 9,900,000 $ 11,100,000        
Interest rate (as a percent) 7.625% 7.625% 7.625%      
Aggregate outstanding principal amount     $ 220,000,000      
Senior secured credit facility            
Long-Term Debt            
Long-term debt current and noncurrent $ 35,052,000 $ 39,000,000        
Maximum borrowing capacity         $ 235,000,000 $ 195,000,000
Available amount 129,700,000          
Borrowing base 168,700,000          
Borrowing outstanding 35,100,000          
Letters of credit 3,900,000          
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 | Minimum            
Long-Term Debt            
Margin over base rate (as a percent) 1.00%          
Senior secured credit facility | Maximum            
Long-Term Debt            
Margin over base rate (as a percent) 1.50%          
Senior secured credit facility | Federal funds rate            
Long-Term Debt            
Base rate federal funds rate          
Margin over base rate (as a percent) 0.50%          
Senior secured credit facility | One month Eurodollar rate            
Long-Term Debt            
Base rate Eurodollar rate          
Margin over base rate (as a percent) 1.00%          
Senior secured credit facility | Adjusted British Bankers Association Interest Settlement Rate | Minimum            
Long-Term Debt            
Margin over base rate (as a percent) 2.00%          
Senior secured credit facility | Adjusted British Bankers Association Interest Settlement Rate | Maximum            
Long-Term Debt            
Margin over base rate (as a percent) 2.50%          
Senior secured credit facility | Interest Rate Scenario 1            
Long-Term Debt            
Borrowing outstanding $ 23,000,000          
Debt Instrument, Interest Rate at Period End 2.709%          
Senior secured credit facility | Interest Rate Scenario 2            
Long-Term Debt            
Borrowing outstanding $ 12,000,000          
Debt Instrument, Interest Rate at Period End 2.7064%          
Senior secured credit facility | Interest Rate Scenario 3            
Long-Term Debt            
Borrowing outstanding $ 100,000          
Debt Instrument, Interest Rate at Period End 4.75%          
Capital lease obligations            
Long-Term Debt            
Long-term debt current and noncurrent $ 16,425,000 $ 15,073,000