Comprehensive Income (Details) (USD $) In Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Reconciliation of net earnings to comprehensive income
Net earnings	$ 56,524	$ 38,835	$ 121,682	$ 81,049
Other comprehensive income:
Foreign currency translation adjustments	(53,416)	31,825	(27,428)	1,451
Unrealized gain on derivative instruments	136
Amortization of transition obligation	(6)	(4)	(17)	(13)
Amortization of net actuarial loss	3,274	3,112	9,887	9,331
Amortization of prior service credit	(406)	(400)	(1,220)	(1,200)
Change in net actuarial loss		(3)	(1,520)	(971)
Total comprehensive income	$ 6,106	$ 73,365	$ 101,384	$ 89,647

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