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NOTES PAYABLE AND CREDIT AGREEMENT - Summary of Credit Agreement and Notes Payable (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended |
--- | --- | ---
Jun. 30, 2014 | Dec. 31, 2013
Debt Instrument [Line Items] |  |
Payments/Long term debt, Total | $ 46,300 | $ 41,475
Less current portion | (850) | (825)
Long term portion | 45,450 | 40,650
Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Payments/Long term debt, Total | 45,000 | 40,000
Average effective interest rate (in hundredths) | 2.50% |
3.25 % notes payable due in next year [Member] |  |
Debt Instrument [Line Items] |  |
Payments/Long term debt, Total | 1,300 | 1,475
Annual installments | $ 850 |
Percentage of interest accrued (in hundredths) | 3.25% |

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