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	$ 280,275	$ 182,090	$ 161,651
Other comprehensive income:
Change in unrealized gain/(loss) on marketable securities, net	3,013	(4,065)	37,006
Change in unrealized gain/(loss) on interest rate swaps, net	450	549	(420)
Change in foreign currency translation adjustment, net	43,515	(82,228)	52,849
Other comprehensive income/(loss)	46,978	(85,744)	89,435
Comprehensive income	327,253	96,346	251,086
Comprehensive income attributable to noncontrolling interests	(19,702)	(11,102)	(35,639)
Comprehensive income attributable to the Company	$ 307,551	$ 85,244	$ 215,447