Annual report pursuant to Section 13 and 15(d)

NATURE OF OPERATIONS AND ACCOUNTING POLICIES - Impairment of Long-Lived Assets (Details)

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NATURE OF OPERATIONS AND ACCOUNTING POLICIES - Impairment of Long-Lived Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Impairment of long-lived assets $ 991 $ 117,018 $ 0