Other Comprehensive Income (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Other Comprehensive Income [Abstract]
Net earnings	$ 90,726	$ 75,773	$ 240,569	$ 182,091
Foreign currency translation adjustment, net of taxes	(16,280)	4,480	(6,502)	(2,054)
Net derivative gain (loss), net of taxes	(52)	(926)	(1,512)	(1,719)
Amount of loss reclassified from accumulated OCI into income, net of taxes	396	1,281	1,509	4,968
Total comprehensive income	$ 74,790	$ 80,608	$ 234,064	$ 183,286