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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Restricted Cash (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Restricted Cash        
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