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Debt (Details) - USD ($)
$ in Thousands
3 Months Ended
Jul. 31, 2015
Mar. 31, 2016
Dec. 31, 2015
Credit facility      
Less: Amounts due within one year   $ 4,250 $ 4,250
Total long-term debt due after one year   405,702 406,286
Accretion of debt financing costs included in interest expense   500  
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      
Total Term Loan outstanding   409,952 410,536
Less: Amounts due within one year   4,250 4,250
Total long-term debt due after one year   405,702 $ 406,286
Debt issuance costs incurred $ 12,900    
Deferred issuance costs, net   11,900  
Face amount $ 425,000    
Amortization per year (as a percent) 1.00%    
Revolving loan      
Credit facility      
Debt issuance costs incurred $ 1,300    
Maximum borrowing available 25,000    
Letter-of-credit sub-facility      
Credit facility      
Maximum borrowing available $ 10,000    
Letters of credit outstanding   2,100  
Credit facility amount outstanding   $ 0