Quarterly report pursuant to Section 13 or 15(d)

Debt (Details)

v3.19.2
Debt (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Jan. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Debt Instrument [Line Items]            
Long-term debt   $ 280,944,000   $ 280,944,000   $ 162,734,000
Less debt issuance costs   (1,868,000)   (1,868,000)   (2,135,000)
Total long-term debt   279,076,000   279,076,000   160,599,000
Less current portion   (10,091,000)   (10,091,000)   (9,466,000)
Long-term debt, less current portion   268,985,000   268,985,000   151,133,000
Long-term Debt, Fiscal Year Maturity [Abstract]            
Total long-term debt   279,076,000   $ 279,076,000   160,599,000
LIBOR            
Debt Instrument [Line Items]            
Base margin       2.50%    
Base Rate            
Debt Instrument [Line Items]            
Base margin       1.25%    
Amended and Restated            
Debt Instrument [Line Items]            
Less debt issuance costs   $ (1,500,000)   $ (1,500,000)    
Amortization period of debt issuance costs 5 years          
Increase in maximum availability       $ 100,000,000    
Duration of interest rate cash flow hedge       3 years    
Effective interest rate   5.16%   5.16%    
Interest expense, net   $ 3,400,000 $ 1,700,000 $ 6,300,000 $ 3,200,000  
Amended and Restated | Swap            
Debt Instrument [Line Items]            
Derivative notional amount   125,000,000   125,000,000   50,000,000
Term Loan            
Debt Instrument [Line Items]            
Long-term debt   75,800,000   75,800,000   80,800,000
Total long-term debt   75,800,000   75,800,000    
Long-term Debt, Fiscal Year Maturity [Abstract]            
2019   5,000,000   5,000,000    
2020   11,875,000   11,875,000    
2021   14,375,000   14,375,000    
2022   15,000,000   15,000,000    
2023   29,550,000   29,550,000    
Total long-term debt   75,800,000   75,800,000    
Revolving Loans            
Debt Instrument [Line Items]            
Long-term debt   205,144,000   205,144,000   81,934,000
Revolving loans maximum borrowing capacity   300,000,000   300,000,000    
Letters of credit outstanding   $ 18,000   $ 18,000   $ 57,000
Minimum | Amended and Restated            
Debt Instrument [Line Items]            
Interest rate range   4.89%   4.89%    
Maximum | Amended and Restated            
Debt Instrument [Line Items]            
Interest rate range   6.75%   6.75%