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Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Total current portion of long-term debt $ 9,119 $ 7,366
Total long-term debt 225,500 70,554
Total Senior Credit Facilities 234,619 77,920
Term Loan    
Debt Instrument [Line Items]    
Current portion of long-term debt, Gross 9,200 7,500
Long-term debt, Gross 79,125 63,750
Total Senior Credit Facilities 88,325  
Term Loan And Revolving Credit Facility    
Debt Instrument [Line Items]    
Less: unamortized debt issuance costs (81) (134)
Less: unamortized debt issuance costs (3,078) (3,196)
Revolving Credit Facility    
Debt Instrument [Line Items]    
Long-term debt, Gross $ 149,453 $ 10,000