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 earnings	$ 109,320	$ 96,798	$ 321,820	$ 270,458
Other comprehensive income (loss), before tax:
Foreign currency translation adjustments	4,598	(8,016)	4,154	(5,295)
Change in marketable securities	56	(40)	46	134
Other comprehensive income (loss), before tax	4,654	(8,056)	4,200	(5,161)
Income tax (expense) benefit attributable to other comprehensive income	(1,759)	3,037	(1,579)	1,946
Other comprehensive income (loss), net of tax	2,895	(5,019)	2,621	(3,215)
Comprehensive income	$ 112,215	$ 91,779	$ 324,441	$ 267,243