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Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Net income $ 70,508 $ 59,148
Other comprehensive income:    
Change in unrealized gain on marketable securities, net 6,767 1,159
Change in foreign currency translation adjustment, net 33,010 54,178
Other comprehensive income 39,777 55,530
Comprehensive income 110,285 114,678
Comprehensive income attributable to noncontrolling interests (4,011) (8,777)
Comprehensive income attributable to the Company 106,274 105,901
Interest Rate Swap [Member]
   
Other comprehensive income:    
Change in unrealized gain on interest rate swaps, net   $ 193