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Debt (Details) - USD ($)
3 Months Ended 12 Months Ended
Jul. 31, 2015
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2016
Nov. 18, 2015
Credit facility          
Long term debt, gross   $ 417,716,000      
Amortization of deferred financing costs   601,000 $ 579,000    
Excess cash flows, repayment of debt, percentage       50.00%  
Excess cash flows threshold for dividends       $ 5,000,000  
Credit Facility          
Credit facility          
Maximum dividends paid and shares and warrants repurchased per fiscal year         $ 12,000,000
Aggregate purchase price of warrants         $ 10,000,000
Credit Facility | Alternate base rate          
Credit facility          
Margin of interest (as a percent) 3.75%        
Credit Facility | LIBOR          
Credit facility          
Margin of interest (as a percent) 4.75%        
Variable rate base minimum (as a percent) 1.00%        
Term loan          
Credit facility          
Debt issuance costs incurred $ 12,900,000        
Deferred issuance costs, net   7,700,000      
Face amount $ 425,000,000        
Amortization per year (as a percent) 1.00%        
Long term debt, gross   414,300,000      
Revolving loan          
Credit facility          
Debt issuance costs incurred $ 1,300,000        
Maximum borrowing available 25,000,000        
Long term debt, gross   0      
Letter-of-credit sub-facility          
Credit facility          
Maximum borrowing available $ 10,000,000 525,000      
Letters of credit, amount outstanding   0      
Level 2 | Term loan          
Credit facility          
Fair value of debt   417,500,000      
Prepayment due to Excess Cash Flow provision | Term loan          
Credit facility          
Repayments of principal in next 12 months   $ 0