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Long-Term Debt (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Feb. 28, 2017
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Long-term debt        
Long-term debt   $ 295,388,000    
Current   3,000,000   $ 3,000,000
Noncurrent   287,466,000   281,699,000
Maturities of Long-term Debt [Abstract]        
2017 (remaining months)   2,250,000    
2018   9,000,000    
2019   284,138,000    
Total   295,388,000    
Capitalized Interest        
Interest capitalized   500,000 $ 300,000  
Line of credit | Alternate Base Rate        
Long-term debt        
Variable rate basis Alternate Base Rate      
Line of credit | Eurocurrency rate        
Long-term debt        
Variable rate basis Eurocurrency rate      
Term loan with maturity in June 2019        
Long-term debt        
Long-term debt   $ 289,388,000   290,138,000
Interest Rate (as a percent)   5.25%    
Original issue discount   $ (4,922,000)   (5,439,000)
Total   290,466,000   284,699,000
Quarterly principal payments   $ 800,000    
Excess cash flow used to prepay debt       0
Covenant, interest rate margin increase (decrease), hypothetical impact of change in debt rating or leverage ratio   0.25%    
Maturities of Long-term Debt [Abstract]        
Total   $ 289,388,000   $ 290,138,000
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   one, two, three or six months Eurocurrency rate    
Margin (as a percent)   4.25%    
Term loan with maturity in May 2022        
Long-term debt        
Long-term debt $ 90,000,000      
Quarterly principal payments 1,100,000      
Maturities of Long-term Debt [Abstract]        
Total $ 90,000,000      
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 $ 30,000,000      
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 $ 230,000,000      
Maturities of Long-term Debt [Abstract]        
Total $ 230,000,000      
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 $ 1,400,000      
Term loan with maturity in May 2023 | After first eight quarters        
Long-term debt        
Quarterly principal payments $ 2,900,000      
Term loan repaid | Eurocurrency rate | Minimum        
Long-term debt        
Variable interest rate floor (as a percent)   1.00%    
Revolving credit facility        
Long-term debt        
Long-term debt   $ 6,000,000    
Interest Rate (as a percent)   5.77%    
Available balance under the facility   $ 24,000,000    
Amounts drawn under the facility   6,000,000 $ 0  
Maturities of Long-term Debt [Abstract]        
Total   $ 6,000,000    
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%