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Consolidated Statements of Comprehensive Income (Unaudited) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Net income $ 68,098 $ 69,869 $ 61,381
Other comprehensive loss, net of tax:      
Net unrealized gain (loss) on available-for-sale investments, net of tax of $129, $123 and ($185) in 2012, 2011, and 2010, respectively (1,311) 355 (507)
Foreign currency translation adjustments, net of tax of $7, $238 and $149 in 2012, 2011, and 2010, respectively (12,546) (8,491) (5,349)
Other comprehensive loss (13,857) (8,136) (5,856)
Comprehensive income $ 54,241 $ 61,733 $ 55,525