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SIGNIFICANT ACCOUNTING POLICIES - Property and Equipment (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2019
USD ($)
facility
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]  
Balance at beginning of Current Period $ 1,898
Accretion expense, included in depreciation and amortization expense 57
Divestitures (61)
Balance at end of Current Period $ 1,894
Number of disposal facilities | facility 16