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Long-Term Debt (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Feb. 28, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Long-term debt        
Long-term debt   $ 314,875 $ 290,138  
Original issue discount   (5,559) (5,439)  
Total   309,316 284,699  
Current   10,250 3,000  
Noncurrent   299,066 281,699  
Covenant, maximum level of annual capital expenditures   105,000    
Cost incurred to the company   6,300    
Loss on early extinguishment of debt   4,826    
Capitalized Interest        
Interest capitalized   1,900 1,600 $ 1,100
Maturities        
2018   10,250    
2019   13,125    
2020   16,000    
2021   16,000    
2022   81,250    
Thereafter   178,250    
Total   $ 314,875 290,138  
Minimum        
Long-term debt        
Covenant, debt service coverage ratio   2.75%    
Maximum        
Long-term debt        
Covenant, debt service coverage ratio   3.25%    
Revolving credit facility        
Long-term debt        
Amounts drawn   $ 10,000 0 $ 0
Line of credit        
Long-term debt        
Amounts drawn   0    
Term loan with maturity in May 2022        
Long-term debt        
Long-term debt $ 90,000 $ 87,750    
Quarterly principal payments 1,100      
Interest Rate (as a percent)   5.13%    
Maturities        
Total $ 90,000 $ 87,750    
Term loan with maturity in May 2022 | Alternate Base Rate        
Long-term debt        
Variable rate basis Alternate Base Rate      
Margin (as a percent) 2.75%      
Term loan with maturity in May 2022 | Eurocurrency rate        
Long-term debt        
Variable rate basis Eurocurrency rate plus      
Margin (as a percent) 3.75%      
Term loan with maturity in May 2022 | Line of credit        
Long-term debt        
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 May 2022 | Line of credit | Alternate Base Rate        
Long-term debt        
Margin (as a percent) 2.75%      
Term loan with maturity in May 2022 | Line of credit | Eurocurrency rate        
Long-term debt        
Margin (as a percent) 3.75%      
Term loan with maturity in May 2023        
Long-term debt        
Long-term debt $ 230,000 $ 227,125    
Interest Rate (as a percent)   5.38%    
Maturities        
Total $ 230,000 $ 227,125    
Term loan with maturity in May 2023 | Alternate Base Rate        
Long-term debt        
Variable rate basis Alternate Base Rate      
Margin (as a percent) 3.00%      
Term loan with maturity in May 2023 | Eurocurrency rate        
Long-term debt        
Variable rate basis Eurocurrency rate      
Margin (as a percent) 4.00%      
Term loan with maturity in June 2019        
Long-term debt        
Arrangement fee and legal costs     300  
Deferred finance costs     $ 400  
First eight quarters | Term loan with maturity in May 2023        
Long-term debt        
Quarterly principal payments $ 1,400      
After first eight quarters | Term loan with maturity in May 2023        
Long-term debt        
Quarterly principal payments $ 2,900