Comprehensive Income (Details) (USD $) In Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Reconciliation of net earnings to comprehensive income
Net earnings	$ 40,033	$ 29,841	$ 65,158	$ 42,214
Other comprehensive income (loss):
Foreign currency translation adjustments	1,645	(28,724)	25,988	(30,374)
Unrealized loss related to derivatives	(136)		(136)
Amortization of transition obligation	(5)	(5)	(11)	(9)
Amortization of net actuarial loss	3,245	3,062	6,613	6,219
Amortization of prior service credit	(408)	(400)	(814)	(800)
Change in net actuarial loss	(1,520)	(886)	(1,520)	(968)
Total comprehensive income	$ 42,854	$ 2,888	$ 95,278	$ 16,282

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