Quarterly report pursuant to Section 13 or 15(d)

BASIS OF PRESENTATION AND ACCOUNTING POLICY Supplemental Cash Flow Information (Details)

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BASIS OF PRESENTATION AND ACCOUNTING POLICY Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Cash and cash equivalents $ 16,553 $ 13,583 $ 26,339 $ 26,950
Restricted cash 0 3,250 3,777 3,777
Total cash, cash equivalents and restricted cash shown in the Consolidated Statement of Cash Flows $ 16,553 $ 16,833 $ 30,116 $ 30,727