Annual report pursuant to Section 13 and 15(d)

LONG-TERM DEBT AND LONG-TERM OBLIGATIONS - Components of Long-term Debt (Details)

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LONG-TERM DEBT AND LONG-TERM OBLIGATIONS - Components of Long-term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Jul. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]      
Long-term debt, gross $ 103,312    
Loan fees 830   $ 501
Total debt 102,482   99,082
Less current portion 4,194   8,061
Total long-term debt, less current portion 98,288   91,021
ARC Agreement, Fourth Amendment      
Debt Instrument [Line Items]      
Loan fees 900    
ARC Agreement      
Debt Instrument [Line Items]      
Loan fees 300    
Term Loan | ARC Agreement, Fourth Amendment      
Debt Instrument [Line Items]      
Long-term debt, gross 85,312   47,250
Total debt 84,500    
Term Loan | ARC Agreement      
Debt Instrument [Line Items]      
Total debt   $ 60,400  
Acquisition Loan | ARC Agreement      
Debt Instrument [Line Items]      
Long-term debt, gross 0   17,333
Revolving Credit Facility | ARC Agreement, Fourth Amendment      
Debt Instrument [Line Items]      
Long-term debt, gross $ 18,000   $ 35,000