Condensed Consolidated Statement of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Net Earnings	$ 28,539	$ 30,935
Foreign currency translation adjustment, net of tax of $428 and $395, respectively	1,463	1,208
Unrealized gain on available-for-sale investments, net of tax of $37 and $9, respectively	127	28
Other Comprehensive Income, net of tax	1,590	1,236
Comprehensive Income	$ 30,129	$ 32,171