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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, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |
Payments/Long term debt, Total | $ 48,099 | $ 60,772
Less current portion | (5,317) | (4,044)
Long term portion | 42,782 | 56,728
Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Payments/Long term debt, Total | $ 42,000 | 54,000
Average effective interest rate | 3.80% |
3.25% through 4.25% Notes Payable due in Next Year [Member] |  |
Debt Instrument [Line Items] |  |
Payments/Long term debt, Total | $ 6,099 | $ 6,772
Annual installments | $ 5,317 |
3.25% through 4.25% Notes Payable due in Next Year [Member] | Minimum [Member] |  |
Debt Instrument [Line Items] |  |
Percentage of interest accrued | 3.25% |
3.25% through 4.25% Notes Payable due in Next Year [Member] | Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Percentage of interest accrued | 4.25% |

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- Definition Amount of the total principal payments made during the annual reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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