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SUPPLEMENTAL CASH FLOW INFORMATION Reconciliation of Cash and Cash Equivalents (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Supplemental Cash Flow Elements [Abstract]        
Cash and cash equivalents $ 73,857 $ 78,348    
Restricted cash included in prepaid expenses and other current assets 6,001 4,674    
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows $ 79,858 $ 83,022 $ 40,354 $ 62,639