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NATURE OF BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES (Impairment of Long-Lived Assets) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]      
Impairment of long-lived assets $ 0 $ 0  
Construction in Progress      
Property, Plant and Equipment [Line Items]      
Impairment of long-lived assets     $ 1,149