Other Comprehensive Earnings (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Foreign currency translation adjustments [Abstract]
Foreign currency translation, pre-tax	$ (91,318)	$ 1,923	$ (48,512)	$ 74,107
Foreign currency translation, tax	(1,074)	16,837	(370)	16,837
Total foreign currency translation, net of tax	(92,392)	18,760	(48,882)	90,944
Changes in fair value of cash flow hedges [Abstract]
Changes in fair value of cash flow hedges, pre-tax	(378)	(176)	377	(575)
Changes in fair value of cash flow hedges, tax	132	62	(132)	201
Total cash flow hedges, net of tax	(246)	(114)	245	(374)
Pension and other postretirement benefit plans [Abstract]
Pension and other postretirement benefit plans, pre-tax	(1,849)	0	(6,316)	0
Pension and other postretirement benefit plans, tax	391	0	2,056	0
Pension and other postretirement benefit plans, net of tax	(1,458)	0	(4,260)	0
Other Comprehensive Income Other Adjustment Net Of Tax [Abstract]
Other comprehensive income loss adjustment, pre-tax	524	1,120	578	869
Other comprehensive income loss other adjustment, tax	(15)	(131)	(26)	(143)
Other comprehensive income loss other adjustment, net of tax	509	989	552	726
Total other comprehensive earnings [Abstract]
Total other comprehensive earnings, pre-tax	(93,021)	2,867	(53,873)	74,401
Total other comprehensive earnings, tax	(566)	16,768	1,528	16,895
Other comprehensive (loss) earnings	$ (93,587)	$ 19,635	$ (52,345)	$ 91,296

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