Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Net income	$ 312,739us-gaap_ProfitLoss	$ 95,860us-gaap_ProfitLoss
Other comprehensive income:
Change in unrealized gain/(loss) on marketable securities, net	15,718	(3,678)
Change in unrealized loss on interest rate swaps	(352)
Change in foreign currency translation adjustment, net	(9,532)	(8,388)
Other comprehensive income/(loss)	5,834	(12,066)
Comprehensive income	318,573	83,794
Comprehensive income attributable to noncontrolling interests	(2,397)	(8,682)
Comprehensive income attributable to the Company	316,176us-gaap_ComprehensiveIncomeNetOfTax	75,112us-gaap_ComprehensiveIncomeNetOfTax
Interest Rate Swap [Member]
Other comprehensive income:
Change in unrealized loss on interest rate swaps	$ (352)

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