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DEBT (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015 | Nov. 04, 2015 | Sep. 30, 2015 | Jul. 14, 2015 | Apr. 07, 2015 | Dec. 31, 2014 | Dec. 03, 2013 | Aug. 30, 2013 | Aug. 20, 2010 | Aug. 12, 2010
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |
Principal amount | $ 548,276 | $ 588,434 |  |  |  |  |  |  |  |  |
Less: Unamortized debt issuance costs | (7,821) | (9,411) |  |  |  |  |  |  |  |  |
Current portion | (540,455) | (579,023) |  |  |  |  |  |  |  |  |
Long-term debt, noncurrent | 0 | 0 |  |  |  |  |  |  |  |  |
Scenario Adjustment | Adoption Of ASU 2015-03 |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |
Current portion |  | 9,411 |  |  |  |  |  |  |  |  |
Deferred financing costs, net |  | 9,411 |  |  |  |  |  |  |  |  |
Secured Debt | $100 Million Term Loan Facility |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |
Principal amount | 54,330 | 60,100 |  |  |  |  |  |  |  |  |
Less: Unamortized debt issuance costs | (955) | (1,201) |  |  |  |  |  |  |  |  |
Current portion | (53,375) |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | 100,000 |  |  | $ 100,000 |  |  |  |  |  |  | $ 100,000
Secured Debt | $253 Million Term Loan Facility |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |
Principal amount | 130,043 | 145,268 |  |  |  |  |  |  |  |  |
Less: Unamortized debt issuance costs | (2,010) | (2,528) |  |  |  |  |  |  |  |  |
Current portion | (128,033) |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | 253,000 | 253,000 |  | 253,000 |  |  |  |  |  | $ 253,000 |
Secured Debt | $44 Million Term Loan Facility |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |
Principal amount | 36,438 | 38,500 |  |  |  |  |  |  |  |  |
Less: Unamortized debt issuance costs | (473) | (584) |  |  |  |  |  |  |  |  |
Current portion | (35,965) |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | 44,000 | 44,000 |  | 44,000 |  |  |  | $ 44,000 |  |  |
Secured Debt | $22 Million Term Loan Facility |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |
Principal amount | 17,500 | 18,625 |  |  |  |  |  |  |  |  |
Less: Unamortized debt issuance costs | (299) | (376) |  |  |  |  |  |  |  |  |
Current portion | (17,201) |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | 22,000 | 22,000 |  | 22,000 | $ 22,000 |  |  |  | $ 22,000 |  |
Secured Debt | 2014 Term Loan Facilities |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |
Principal amount | 29,006 | 31,069 |  |  |  |  |  |  |  |  |
Less: Unamortized debt issuance costs | (1,571) | (1,715) |  |  |  |  |  |  |  |  |
Revolving Credit Facility | 2015 Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |
Principal amount | 51,294 | 56,218 |  |  |  |  |  |  |  |  |
Current portion | (51,294) |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | $ 59,500 |  |  |  |  |
Line of Credit Facility | $98 Million Credit Facility |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |
Principal amount | 98,271 | 98,271 |  |  |  |  |  |  |  |  |
Less: Unamortized debt issuance costs | (1,994) | (2,368) |  |  |  |  |  |  |  |  |
Current portion | (96,277) |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | 98,000 | 98,000 | $ 98,000 |  |  |  |  |  |  |  |
Line of Credit Facility | $148 Million Credit Facility |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |
Principal amount | 131,394 | 140,383 |  |  |  |  |  |  |  |  |
Less: Unamortized debt issuance costs | (519) | (639) |  |  |  |  |  |  |  |  |
Current portion | (130,875) |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 148,000 | $ 148,000 |  | $ 148,000 | $ 148,000 |  | $ 148,000 |  |  |  |

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