Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 13,504	$ 30,372	$ 30,277	$ 49,689
Foreign currency translation adjustments	(3,262)	(33,450)	(27,895)	(33,255)
Net change in:
Deferred gains (losses) on cash flow hedges, net of taxes of $1,045, $(593), $938, and $(974), respectively	(2,823)	1,475	(2,558)	2,476
Unrecognized retirement obligations, net of taxes of $(1,895), $(1,463), $(5,675), and $(4,391), respectively	3,083	2,398	9,253	7,193
Other comprehensive loss	(3,002)	(29,577)	(21,200)	(23,586)
Comprehensive income	$ 10,502	$ 795	$ 9,077	$ 26,103