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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Net income $ 620,000 $ 543,966 $ 452,826
Other comprehensive income (loss) before tax      
Unrealized gain (loss) on marketable securities 2,424 (1,053) 4,332
Reclassification of unrealized gains on marketable securities to income (1,436) (672) (1,218)
Other than temporary impairment     785
Gain on sale of marketable securities previously impaired   (2,017)  
Unrealized gain (loss) on forward contracts 1,524 (225)  
Other comprehensive income, before tax 2,512 (3,967) 3,899
Related income tax income (expense) (556) 1,033 (870)
Other comprehensive income, net of tax 1,956 (2,934) 3,029
Total comprehensive income 621,956 541,032 455,855
Accumulated other comprehensive income (net of taxes in the amount of $ 4,909, $3,876 and $ 4,428, in 2010, 2011 and 2012, respectively) $ 14,606 $ 12,650 $ 15,584