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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Restricted Cash (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Restricted Cash        
Cash and cash equivalents $ 172,775 $ 174,479 $ 138,873 $ 133,400
Restricted cash - current 5,447 7,234 7,871 8,242
Restricted cash - noncurrent 22,977 23,233 27,151 27,426
Cash, cash equivalents and restricted cash $ 201,199 $ 204,946 $ 173,895 $ 169,068