ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax expense (benefit) related to items in other comprehensive loss	$ 2,333	$ (800)	$ (375)
Pension Plan
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax expense (benefit) related to items in other comprehensive loss	0
Cash Flow Hedging
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax expense (benefit) related to items in other comprehensive loss	$ 2,300