Quarterly report pursuant to Section 13 or 15(d)

Debt (Details)

v3.19.1
Debt (Details) - USD ($)
 1 Months Ended 3 Months Ended
Jan. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Debt Instrument [Line Items]        
Long-term debt   $ 277,148,000   $ 162,734,000
Less debt issuance costs   (2,001,000)   (2,135,000)
Total long-term debt   275,147,000   160,599,000
Less current portion   (9,466,000)   (9,466,000)
Long-term debt, less current portion   265,681,000   151,133,000
Long-term Debt, Fiscal Year Maturity [Abstract]        
Total long-term debt   $ 275,147,000   160,599,000
LIBOR        
Debt Instrument [Line Items]        
Base margin   1.75%    
Base Rate        
Debt Instrument [Line Items]        
Base margin   0.50%    
Amended and Restated        
Debt Instrument [Line Items]        
Less debt issuance costs   $ (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   4.41%    
Interest expense, net   $ 2,900,000 $ 1,500,000  
Amended and Restated | Swap        
Debt Instrument [Line Items]        
Derivative notional amount   125,000,000   50,000,000
Term Loan        
Debt Instrument [Line Items]        
Long-term debt   78,300,000   80,800,000
Total long-term debt   78,300,000    
Long-term Debt, Fiscal Year Maturity [Abstract]        
2019   7,500,000    
2020   11,875,000    
2021   14,375,000    
2022   15,000,000    
2023   29,550,000    
Total long-term debt   78,300,000    
Revolving Loans        
Debt Instrument [Line Items]        
Long-term debt   198,848,000   81,934,000
Revolving loans maximum borrowing capacity   300,000,000    
Letters of credit outstanding   $ 0   $ 57,000
Minimum | Amended and Restated        
Debt Instrument [Line Items]        
Interest rate range   4.23%    
Maximum | Amended and Restated        
Debt Instrument [Line Items]        
Interest rate range   6.00%