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NOTES PAYABLE AND AMENDED CREDIT AGREEMENT - Summary of Notes Payable and Credit Agreement (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Payments/Long term debt, Total $ 58,374 $ 49,110
Less current portion (1,253) (775)
Long term portion 57,121 48,335
Credit Facility [Member]    
Debt Instrument [Line Items]    
Payments/Long term debt, Total $ 52,500 44,000
Average effective interest rate 2.20%  
3.25 % through 3.5 % notes payable due in next year [Member]    
Debt Instrument [Line Items]    
Payments/Long term debt, Total $ 5,874 $ 5,110
Annual installments $ 1,253  
Percentage of interest accrued, minimum 3.25%  
Percentage of interest accrued, maximum 3.50%