Quarterly report pursuant to Section 13 or 15(d)

Debt (Details)

v3.4.0.3
Debt (Details)
1 Months Ended 9 Months Ended
Feb. 29, 2016
USD ($)
Sep. 30, 2014
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Line of Credit Facility [Line Items]        
Line of credit facility, additional borrowing capacity   $ 150,000,000.0    
Revolving line of credit outstanding     $ 0 $ 40,000,000
Unamortized debt issuance costs     1,600,000 1,000,000
Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Line of credit facility, maximum borrowing capacity   $ 200,000,000.0    
Ratio of indebtedness   3.25    
Revolving line of credit outstanding     0 $ 40,000,000
Revolving line of credit facility, available borrowing capacity     200,000,000  
Revolving Credit Facility | Federal Funds Rate        
Line of Credit Facility [Line Items]        
Basis spread on interest rate   0.50%    
Revolving Credit Facility | LIBOR        
Line of Credit Facility [Line Items]        
Basis spread on interest rate   1.00%    
Revolving Credit Facility | LIBOR | Minimum        
Line of Credit Facility [Line Items]        
Basis spread on interest rate   1.25%    
Revolving Credit Facility | Base Rate | Minimum        
Line of Credit Facility [Line Items]        
Basis spread on interest rate   0.25%    
Letters of credit        
Line of Credit Facility [Line Items]        
Sub limit for issuance of letters of credit   $ 10,000,000.0    
Revolving line of credit facility, available borrowing capacity     10,000,000  
Swingline Loan        
Line of Credit Facility [Line Items]        
Sub limit for issuance of letters of credit   $ 20,000,000.0    
Revolving line of credit facility, available borrowing capacity     20,000,000  
Term Loan        
Line of Credit Facility [Line Items]        
Revolving line of credit outstanding     125,000,000  
Amendment | Line of Credit        
Line of Credit Facility [Line Items]        
Line of credit facility, maximum borrowing capacity $ 125,000,000.0      
Debt issuance costs $ 700,000      
Amendment | Line of Credit | LIBOR        
Line of Credit Facility [Line Items]        
Basis spread on interest rate 2.00%      
Amendment | Line of Credit | Base Rate        
Line of Credit Facility [Line Items]        
Ratio of indebtedness 4.00      
Basis spread on interest rate 1.00%      
Amendment | Convertible Debt        
Line of Credit Facility [Line Items]        
Principal amount $ 150,000,000.0      
Amendment | Term Loan        
Line of Credit Facility [Line Items]        
Unamortized debt issuance costs     $ 700,000