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Long-Term Debt (Schedule of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Total debt $ 58,438 $ 80,462
Less: current portion of long-term debt (6,742) (4,707)
Less: deferred financing costs (1,310) (749)
Long-term debt 50,386 75,006
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Total debt 19,567 38,024
Notes [Member]    
Debt Instrument [Line Items]    
Total debt 19,000 19,000
Term Loan [Member]    
Debt Instrument [Line Items]    
Total debt 18,141 21,541
Capital Leases [Member]    
Debt Instrument [Line Items]    
Total debt $ 1,730 $ 1,897