Quarterly report pursuant to Section 13 or 15(d)

Debt (Details)

v3.5.0.2
Debt (Details)
6 Months Ended 9 Months Ended
Jun. 30, 2016
USD ($)
Sep. 30, 2014
USD ($)
Feb. 29, 2016
USD ($)
Dec. 31, 2015
USD ($)
Line of Credit Facility [Line Items]        
Revolving line of credit outstanding $ 0     $ 40,000,000
Unamortized debt issuance costs 1,500,000     1,000,000
Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Line of credit facility, maximum borrowing capacity   $ 200,000,000.0    
Line of credit facility, additional borrowing capacity   $ 150,000,000.0    
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 | 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% 1.25%    
Revolving Credit Facility | LIBOR | Maximum        
Line of Credit Facility [Line Items]        
Basis spread on interest rate 2.00% 2.00%    
Revolving Credit Facility | Federal Funds Rate        
Line of Credit Facility [Line Items]        
Basis spread on interest rate   0.50%    
Revolving Credit Facility | Base Rate | Minimum        
Line of Credit Facility [Line Items]        
Basis spread on interest rate 0.25% 0.25%    
Revolving Credit Facility | Base Rate | Maximum        
Line of Credit Facility [Line Items]        
Basis spread on interest rate 1.00% 1.00%    
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 124,200,000      
Amendment        
Line of Credit Facility [Line Items]        
Line of credit facility, additional borrowing capacity 25,000,000.0      
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 | Base Rate        
Line of Credit Facility [Line Items]        
Ratio of indebtedness     4.00  
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 $ 600,000