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COMMITMENTS AND CONTINGENCIES - Contractual obligations and commercial commitments (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2013
COMMITMENTS AND CONTINGENCIES |  |  |  |
Outstanding letters of credit | $ 20,900 |  |  |
Outstanding purchase commitments, including agreements that are non-cancelable and cancelable | 106,300 |  |  |
Uncertain Tax Positions |  |  |  |
Gross unrecognized tax benefits | 18,728 | $ 20,137 | $ 22,694 | $ 45,382
Unrecognized tax benefits that would impact the annual effective tax rate if recognized | 2,061 | $ 3,470 | $ 6,027 |
Unrecognized tax benefits if recognized, would impact certain deferred tax assets | $ 16,700 |  |  |

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