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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 6 Months Ended
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Jun. 30, 2019
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |
Schedule of restricted cash and cash equivalents |
|  | June 30, |  | December 31, |  | June 30, |  | December 31, |
|  | 2019 |  | 2018 |  | 2018 |  | 2017 |
Cash and cash equivalents |  | $ | 165,121 |  | $ | 197,499 |  | $ | 269,996 |  | $ | 174,479 |
Restricted cash - current |  |  | — |  |  | 4,947 |  |  | — |  |  | 7,234 |
Restricted cash - noncurrent |  |  | 315 |  |  | 315 |  |  | 315 |  |  | 23,233 |
Cash, cash equivalents and restricted cash |  | $ | 165,436 |  | $ | 202,761 |  | $ | 270,311 |  | $ | 204,946 |

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- Definition Tabular disclosure of supplemental cash flow information for the periods presented. + References No definition available. + Details
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