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COMPREHENSIVE INCOME (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
COMPREHENSIVE INCOME                      
Net income $ 65,906 $ 93,981 $ 69,023 $ 86,376 $ 46,704 $ 53,059 $ 47,320 $ 46,654 $ 315,286 $ 193,737 $ 143,734
Adoption of ASC 860 and ASC 810                   55,881  
Unrealized gain (loss) on securities available-for-sale                 27,035 (12,939) (23,912)
Foreign currency translation adjustments                 (15,591) (11,701) 6,020
Total comprehensive income, net of tax                 326,730 224,978 125,842
Unrealized gain (loss) on securities available-for-sale 6,953       (75,963)       6,953 (75,963)  
Adoption of ASC 860 and ASC 810         55,881         55,881  
Unrealized foreign currency loss (30,009)       (14,418)       (30,009) (14,418)  
Total accumulated other comprehensive loss $ (23,056)       $ (34,500)       $ (23,056) $ (34,500)