Annual report pursuant to Section 13 and 15(d)

Debt (Details)

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Debt (Details) - USD ($)
 11 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]      
Long-term debt   $ 162,734,000 $ 173,699,000
Less debt issuance costs   (2,135,000) (1,125,000)
Total long-term debt   160,599,000 172,574,000
Less current portion   (9,466,000) (6,960,000)
Long-term debt, less current portion   151,133,000 165,614,000
Long-term Debt, Fiscal Year Maturity [Abstract]      
Total long-term debt   160,599,000 172,574,000
Amended and Restated      
Debt Instrument [Line Items]      
Revolving loans, potential increment in maximum borrowing capacity   $ 100,000,000  
Duration of interest rate cash flow hedge   3 years  
Derivative, notional amount   $ 50,000,000  
Effective interest rate   4.17%  
Interest expense, net $ 7,800,000 $ 6,900,000 7,200,000
Amended and Restated | LIBOR      
Debt Instrument [Line Items]      
Base margin   1.75%  
Amended and Restated | Base Rate      
Debt Instrument [Line Items]      
Base margin   0.50%  
Term Loan      
Debt Instrument [Line Items]      
Long-term debt   $ 80,800,000 94,375,000
Total long-term debt   80,800,000  
Long-term Debt, Fiscal Year Maturity [Abstract]      
2019   10,000,000  
2020   11,875,000  
2021   14,375,000  
2022   15,000,000  
2023   29,550,000  
Total long-term debt   80,800,000  
Revolving Loans      
Debt Instrument [Line Items]      
Long-term debt   81,934,000 79,324,000
Revolving loans maximum borrowing capacity   300,000,000  
Letters of credit outstanding   $ 57,000 $ 0
Minimum | Amended and Restated      
Debt Instrument [Line Items]      
Stated interest rate   3.00%  
Maximum | Amended and Restated      
Debt Instrument [Line Items]      
Stated interest rate   6.00%