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Long-Term Debt (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Feb. 28, 2017
Jan. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Long-term debt          
Long-term debt     $ 290,138    
Original issue discount     (5,439) $ (7,092)  
Total     284,699 286,046  
Current     3,000 3,000  
Long-term debt     281,699 283,046  
Capitalized Interest          
Interest capitalized     1,600 1,100 $ 1,100
Maturities          
2017     3,000    
2018     3,000    
2019     284,138    
Total     290,138    
Revolving credit facility          
Long-term debt          
Available balance under the facility     30,000    
Amounts drawn under the facility     $ 0 0  
Revolving credit facility | Prime rate | Minimum          
Long-term debt          
Variable rate basis     prime rate    
Margin (as a percent)     3.00%    
Revolving credit facility | Prime rate | Maximum          
Long-term debt          
Variable rate basis     prime rate    
Margin (as a percent)     6.00%    
Revolving credit facility | Eurocurrency rate | Minimum          
Long-term debt          
Variable rate basis     Eurocurrency rate for one, two, three or six month periods    
Margin (as a percent)     4.00%    
Revolving credit facility | Eurocurrency rate | Maximum          
Long-term debt          
Variable rate basis     Eurocurrency rate for one, two, three or six month periods    
Margin (as a percent)     5.50%    
Line of credit | Eurocurrency rate | Subsequent Event          
Long-term debt          
Variable rate basis   Eurocurrency rate      
Margin (as a percent) 3.75%        
Covenant, interest rate margin increase (decrease), hypothetical impact of change in debt rating or leverage ratio (0.25%)        
Available balance under the facility $ 30,000        
Term loan with maturity in June 2019          
Long-term debt          
Long-term debt     $ 290,138 293,138  
Quarterly principal payments     800    
Arrangement fee and legal costs     300    
Deferred finance costs     400    
Maturities          
Total     $ 290,138 $ 293,138  
Term loan with maturity in June 2019 | Maximum          
Long-term debt          
Percentage of excess cash flow used to prepay the debt     75.00%    
Term loan with maturity in June 2019 | Prime rate          
Long-term debt          
Variable rate basis     prime rate    
Margin (as a percent)     3.25%    
Term loan with maturity in June 2019 | Eurocurrency rate          
Long-term debt          
Interest Rate (as a percent)     5.25%    
Variable rate basis     Eurocurrency rate for one, two, three or six month periods    
Margin (as a percent)     4.25%    
Variable interest rate floor (as a percent)     1.00%    
Covenant, interest rate margin increase (decrease), hypothetical impact of change in debt rating or leverage ratio     0.25%    
Term loan with maturity in May 2022 | Subsequent Event          
Long-term debt          
Long-term debt 90,000        
Quarterly principal payments 1,100        
Maturities          
Total $ 90,000        
Term loan with maturity in May 2022 | Alternate Base Rate | Subsequent Event          
Long-term debt          
Variable rate basis   Alternate Base Rate      
Margin (as a percent) 2.75%        
Term loan with maturity in May 2022 | Eurocurrency rate | Subsequent Event          
Long-term debt          
Variable rate basis   Eurocurrency rate      
Margin (as a percent) 3.75%        
Term loan with maturity in May 2023 | Subsequent Event          
Long-term debt          
Long-term debt $ 230,000        
Maturities          
Total $ 230,000        
Term loan with maturity in May 2023 | Alternate Base Rate | Subsequent Event          
Long-term debt          
Variable rate basis   Alternate Base Rate      
Margin (as a percent) 3.00%        
Term loan with maturity in May 2023 | Eurocurrency rate | Subsequent Event          
Long-term debt          
Variable rate basis   Eurocurrency rate      
Margin (as a percent) 4.00%        
June 30, 2016 to September 30, 2017 | Term loan with maturity in June 2019          
Long-term debt          
Maximum allowable leverage ratio     3.00    
December 31, 2017 to September 30, 2018 | Term loan with maturity in June 2019          
Long-term debt          
Maximum allowable leverage ratio     2.75    
December 31, 2018 and each subsequent quarter | Term loan with maturity in June 2019          
Long-term debt          
Maximum allowable leverage ratio     2.50    
First eight quarters | Term loan with maturity in May 2023 | Subsequent Event          
Long-term debt          
Quarterly principal payments $ 1,400        
After first eight quarters | Term loan with maturity in May 2023 | Subsequent Event          
Long-term debt          
Quarterly principal payments $ 2,900