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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Restricted Cash (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Restricted Cash        
Cash and cash equivalents $ 155,889 $ 197,499 $ 174,479 $ 133,400
Restricted cash - current 6,045 4,947 7,234 8,242
Restricted cash - noncurrent 315 315 23,233 27,426
Cash, cash equivalents and restricted cash $ 162,249 $ 202,761 $ 204,946 $ 169,068