ACCUMULATED OTHER COMPREHENSIVE INCOME (Reclassified AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other operating income, net	$ 1,369	$ 1,188
Comprehensive income attributable to noncontrolling interest	(4,483)	(1,651)
Income tax benefit (expense)	(6,936)	(6,281)
Net gain from accumulated other comprehensive income	(636)		$ (1,503)
Cash flow hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net gain from accumulated other comprehensive income	(795)	(404)	$ (1,968)
Cash flow hedges | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Comprehensive income attributable to noncontrolling interest	330	168
Income tax benefit (expense)	308	156
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	(1,297)	(446)
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	$ (136)	$ (282)