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DEBT - Interest Rates (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 21, 2005 | Sep. 30, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Interest rates on debt |  |  |  |  |
Effective Interest Rate (as a percent) |  |  | 5.29% | 4.50% | 3.65%
Letter of credit |  |  |  |  |
Restricted cash, non-current |  |  | $ 23,233 | $ 27,426 | $ 315
Minimum |  |  |  |  |
Interest rates on debt |  |  |  |  |
Range of interest rates (excluding unused commitment fees) |  |  | 3.36% | 2.69% | 2.69%
Maximum |  |  |  |  |
Interest rates on debt |  |  |  |  |
Range of interest rates (excluding unused commitment fees) |  |  | 7.82% | 7.12% | 6.73%
Letter of credit |  |  |  |  |
Letter of credit |  |  |  |  |
Fee on letter of credit (as a percent) | 1.00% | 1.375% | 1.375% | 1.375% |
Amount of letters outstanding |  |  | $ 300 | $ 300 |
Restricted cash, non-current |  |  | $ 315 | $ 315 |
Letter of credit | Minimum |  |  |  |  |
Letter of credit |  |  |  |  |
Notice period for cancellation of line of credit |  |  | 30 days |  |

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