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	$ 231,011	$ 428,329	$ 371,500
Other comprehensive income, net of tax:
Foreign currency translation adjustments	(118,705)	(128,666)	(71,282)
Pension-related adjustments	1,531	(1,947)	859
Other comprehensive income	(117,174)	(130,613)	(70,423)
Comprehensive Income	$ 113,837	$ 297,716	$ 301,077