CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net income	$ 48,274	$ 49,787	$ 129,786	$ 128,968
Other comprehensive income (loss):
Foreign currency translation adjustments	2,228	(6,753)	2,166	(2,646)
Income tax effect	(855)	2,642	(867)	1,035
Foreign currency translation adjustments, net	1,373	(4,111)	1,299	(1,611)
Unrealized gains (losses) on cash flow hedges	610	(617)	1,134	(3,140)
Income tax effect	(234)	242	(457)	1,229
Unrealized gains (losses) on cash flow hedges, net	376	(375)	677	(1,911)
Unrealized gains (losses) on available-for-sale securities	10		8	1
Income tax effect	(4)		(4)
Unrealized gains (losses) on available-for-sale securities, net	6		4	1
Pension and other post-retirement adjustments	120	50	1,033	9
Income tax effect	(56)	(8)	(276)
Pension and other post-retirement adjustments, net	64	42	757	9
Other comprehensive income, net of tax	1,819	(4,444)	2,737	(3,512)
Comprehensive income	$ 50,093	$ 45,343	$ 132,523	$ 125,456