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Line of Credit and Long-Term Debt - Components of Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Long-term debt consists of:    
Long-term debt $ 76,153 $ 74,215
Less: line-of-credit and current maturities of long-term debt (3,659) (815)
Less: deferred loan costs (174) (177)
Long-term debt, less current portion 72,320 73,223
Revolving line of credit    
Long-term debt consists of:    
Long-term debt 2,000 0
Note payable to a bank    
Long-term debt consists of:    
Long-term debt $ 74,153 $ 74,215