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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Restricted Cash (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Restricted Cash        
Cash and cash equivalents $ 165,724 $ 174,479 $ 152,511 $ 133,400
Restricted cash - current   7,234 8,593 8,242
Restricted cash - noncurrent 315 23,233 24,001 27,426
Cash, cash equivalents and restricted cash $ 166,039 $ 204,946 $ 185,105 $ 169,068