Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
NET INCOME	$ 225,037	$ 260,755	$ 271,296
OTHER COMPREHENSIVE (LOSS)/INCOME:
Foreign currency translation adjustment	(86,968)	(56,059)	(62,532)
Net unrealized (loss)/income on qualifying cash flow hedges, net of tax benefit/(provision) of $2,558, $15,649 and ($13,992), respectively	(3,837)	(23,473)	20,988
Changes in pension and other postretirement benefit obligations, net of tax (provision) of ($2,552), ($670) and ($208), respectively	9,600	1,191	362
Other comprehensive loss	(81,205)	(78,341)	(41,182)
COMPREHENSIVE INCOME	$ 143,832	$ 182,414	$ 230,114