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Consolidated Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Statement of Comprehensive Income [Abstract]        
Net income $ 71,018 $ 29,471 $ 124,133 $ 32,160
Other comprehensive income (loss):        
Foreign currency translation adjustments 1,918 30 2,379 (2,259)
Change in unrealized gains (losses) on available-for-sale securities, net of tax of $51, $(1,239), $342, and $(1,451), respectively 81 (1,985) 548 (2,324)
Total other comprehensive income (loss) 1,999 (1,955) 2,927 (4,583)
Comprehensive income $ 73,017 $ 27,516 $ 127,060 $ 27,577