Quarterly report pursuant to Section 13 or 15(d)

Debt (Details)

v3.5.0.2
Debt (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Jan. 31, 2015
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Long-term Debt, Fiscal Year Maturity [Abstract]            
Debt outstanding   $ 233,000,000   $ 233,000,000   $ 235,000,000
Deferred financing costs   $ 1,800,000   $ 1,800,000   2,200,000
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            
Debt Instrument [Line Items]            
Financing costs $ 2,700,000          
Amortization period of debt issuance costs 5 years          
Long-term Debt, Fiscal Year Maturity [Abstract]            
Revolving loans potential increment in maximum borrowing capacity       $ 75,000,000    
Duration of interest rate cash flow hedge   3 years        
Effective interest rate   3.18%   3.18%    
Interest expense, net   $ 2,000,000 $ 1,900,000 $ 5,800,000 $ 5,300,000  
Amended and Restated | Minimum            
Long-term Debt, Fiscal Year Maturity [Abstract]            
Interest rate range   2.77%   2.77%    
Amended and Restated | Maximum            
Long-term Debt, Fiscal Year Maturity [Abstract]            
Interest rate range   4.50%   4.50%    
Amended and Restated | Swap            
Long-term Debt, Fiscal Year Maturity [Abstract]            
Derivative notional amount   $ 100,000,000   $ 100,000,000    
Term Loan Facility            
Long-term Debt, Fiscal Year Maturity [Abstract]            
Term loan payments 2016   4,700,000   4,700,000    
Term loan payments 2017   21,600,000   21,600,000    
Term loan payments 2018   28,100,000   28,100,000    
Term loan payments 2019   30,000,000   30,000,000    
Term loan payments 2020   36,200,000   36,200,000    
Borrowings outstanding   120,600,000   120,600,000    
Revolving Loan Facility            
Long-term Debt, Fiscal Year Maturity [Abstract]            
Revolving loans maximum borrowing capacity   150,000,000   150,000,000    
Revolving loans amount outstanding   112,600,000   112,600,000   101,000,000
Letters of credit outstanding   $ 11,000   $ 11,000   $ 0