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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 6 Months Ended
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Jun. 30, 2018
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |
Schedule of restricted cash and cash equivalents |
|  | June 30, |  | December 31, |  | June 30, |  | December 31, |
|  | 2018 |  | 2017 |  | 2017 |  | 2016 |
Cash and cash equivalents |  | $ | 269,996 |  | $ | 174,479 |  | $ | 147,153 |  | $ | 133,400 |
Restricted cash - current |  |  | — |  |  | 7,234 |  |  | 8,335 |  |  | 8,242 |
Restricted cash - noncurrent |  |  | 315 |  |  | 23,233 |  |  | 25,507 |  |  | 27,426 |
Cash, cash equivalents and restricted cash |  | $ | 270,311 |  | $ | 204,946 |  | $ | 180,995 |  | $ | 169,068 |

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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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