Quarterly report pursuant to Section 13 or 15(d)

Debt (Details)

v3.7.0.1
Debt (Details) - USD ($)
1 Months Ended 3 Months Ended
Jan. 31, 2015
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Long-term Debt, Fiscal Year Maturity [Abstract]        
Debt outstanding   $ 217,600,000   $ 216,300,000
Deferred financing costs   $ 1,500,000   1,700,000
LIBOR        
Long-term Debt, Fiscal Year Maturity [Abstract]        
Base margin   2.25%    
Base Rate        
Long-term Debt, Fiscal Year Maturity [Abstract]        
Base margin   1.00%    
Amended and Restated        
Long-term Debt, Fiscal Year Maturity [Abstract]        
Revolving loans potential increment in maximum borrowing capacity   $ 75,000,000    
Amortization period of debt issuance costs 5 years      
Duration of interest rate cash flow hedge   3 years    
Effective interest rate   3.41%    
Interest expense, net   $ 1,900,000 $ 2,000,000  
Amended and Restated | Minimum        
Long-term Debt, Fiscal Year Maturity [Abstract]        
Interest rate range   3.19%    
Amended and Restated | Maximum        
Long-term Debt, Fiscal Year Maturity [Abstract]        
Interest rate range   5.00%    
Amended and Restated | Swap        
Long-term Debt, Fiscal Year Maturity [Abstract]        
Derivative notional amount   $ 85,000,000    
Term Loan Facility        
Long-term Debt, Fiscal Year Maturity [Abstract]        
Term loan payments 2017   16,900,000    
Term loan payments 2018   28,100,000    
Term loan payments 2019   30,000,000    
Term loan payments 2020   36,300,000    
Borrowings outstanding   111,300,000    
Revolving Loan Facility        
Long-term Debt, Fiscal Year Maturity [Abstract]        
Revolving loans maximum borrowing capacity   150,000,000    
Revolving loans amount outstanding   106,300,000   100,400,000
Letters of credit outstanding   $ 0   $ 0