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COMMITMENTS AND CONTINGENCIES - Contractual obligations and commercial commitments (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
COMMITMENTS AND CONTINGENCIES |  |  |  |
Outstanding letters of credit | $ 14,700 |  |  |
Outstanding purchase commitments, including agreements that are non-cancelable and cancelable without penalty | 44,000 |  |  |
Uncertain tax position |  |  |  |
Gross unrecognized tax benefits | 20,137 | $ 22,694 | $ 45,382 | $ 45,430
Unrecognized tax benefits that would impact the annual effective tax rate if recognized | 3,470 | $ 6,027 | $ 10,185 |
Unrecognized tax benefits if recognized, would impact certain deferred tax assets | $ 16,600 |  |  |

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