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COMMITMENTS AND CONTINGENCIES - Contractual obligations and commercial commitments (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Commitments And Contingencies Disclosure [Abstract] |  |  |  |
Outstanding letters of credit | $ 16,700 |  |  |
Outstanding purchase commitments, including agreements that are non-cancelable and cancelable | 31,700 |  |  |
Uncertain Tax Positions |  |  |  |
Gross unrecognized tax benefits | 17,496 | $ 18,728 | $ 20,137 | $ 22,694
Unrecognized tax benefits that would impact the annual effective tax rate if recognized | 829 | $ 2,061 | $ 3,470 |
Unrecognized tax benefits if recognized, would impact certain deferred tax assets | $ 16,600 |  |  |

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