ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Reclassified AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other operating income, net	$ 7,844	$ 5,499	$ 22,702	$ 20,867
Comprehensive income attributable to noncontrolling interest	(2,289)	(3,649)	(13,537)	(11,808)
Income tax expense (Note 7)	$ (3,043)	$ (779)	(16,817)	(2,274)
Net (gain) loss from accumulated other comprehensive income			(1,755)		$ (1,510)
Cash flow hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net (gain) loss from accumulated other comprehensive income			(2,104)	223	$ 583
Cash flow hedges | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Comprehensive income attributable to noncontrolling interest			873	(235)
Income tax expense (Note 7)			818	(87)
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			(2,928)	43
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			$ (867)	$ 502