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Long-Term Debt (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Feb. 28, 2017
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Long-term debt        
Long-term debt   $ 310,312    
Debt issue costs and issue discount   (5,258)   $ (5,559)
Total   305,054   309,316
Current   10,250   10,250
Noncurrent   294,804   299,066
Covenant, maximum level of annual capital expenditures   105,000    
Maturities        
2018 (remaining months)   7,688    
2019   13,125    
2020   16,000    
2021   16,000    
2022   81,250    
Thereafter   176,249    
Total   310,312    
Capitalized Interest        
Interest capitalized   $ 300 $ 500  
Minimum        
Long-term debt        
Covenant, debt service coverage ratio   2.75%    
Maximum        
Long-term debt        
Covenant, debt service coverage ratio   3.25%    
Line of credit        
Long-term debt        
Amounts drawn   $ 0    
Revolving credit facility        
Long-term debt        
Amounts drawn     $ 6,000  
Term loan with maturity in May 2022        
Long-term debt        
Average Interest Rate   5.52%    
Long-term debt $ 90,000 $ 86,070   87,750
Quarterly principal payments 1,100      
Maturities        
Total $ 90,000 $ 86,070   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      
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        
Average Interest Rate   5.77%    
Long-term debt $ 230,000 $ 224,242   227,125
Maturities        
Total $ 230,000 $ 224,242   $ 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 May 2023 | First eight quarters        
Long-term debt        
Quarterly principal payments $ 1,400      
Term loan with maturity in May 2023 | After first eight quarters        
Long-term debt        
Quarterly principal payments $ 2,900