SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Part 3 (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Impairment of Long-Lived Assets [Abstract]
Impairment of long-lived assets	$ 0	$ 11,500	$ 0
Concentration of Credit Risk [Abstract]
Federal deposit insurance limit	250
Excess cash, FDIC uninsured amount	53,900
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Income tax benefit	(274)	200	$ 242
ASU 2016-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Income tax benefit	$ 0	$ 0