ACCUMULATED OTHER COMPREHENSIVE INCOME (Reclassified AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other operating income, net	$ 1,659	$ 785	$ 3,029	$ 1,973
Comprehensive (loss) income attributable to noncontrolling interest	5,011	(9,595)	528	(11,247)
Income tax benefit (expense)	$ (7,110)	$ (7,493)	(14,047)	(13,774)
Net gain from accumulated other comprehensive income			(671)		$ (1,503)
Cash flow hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net gain from accumulated other comprehensive income			(1,009)	(1,255)
Cash flow hedges | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Comprehensive (loss) income attributable to noncontrolling interest			419	521
Income tax benefit (expense)			391	488
Cash flow hedges | Reclassification out of Accumulated Other Comprehensive Income | Foreign currency exchange contracts
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other operating income, net			(1,654)	(1,730)
Cash flow hedges | Reclassification out of Accumulated Other Comprehensive Income | Foreign currency option contracts
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other operating income, net			$ (165)	$ (534)