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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Restricted Cash (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Restricted Cash        
Cash and cash equivalents $ 187,713 $ 197,499 $ 172,775 $ 174,479
Restricted cash - current 4,947 4,947 5,447 7,234
Restricted cash - noncurrent 315 315 22,977 23,233
Cash, cash equivalents and restricted cash $ 192,975 $ 202,761 $ 201,199 $ 204,946