Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net income	$ 57,188	$ 57,084	$ 180,968	$ 188,620
Other comprehensive income:
Change in unrealized gain on marketable securities, net	17,660	1,382	23,888	2,311
Change in foreign currency translation adjustment, net	305	42,807	(2,199)	52,378
Other comprehensive income	17,965	44,220	21,689	55,092
Comprehensive income	75,153	101,304	202,657	243,712
Comprehensive income attributable to noncontrolling interests	(1,720)	(3,259)	(5,931)	(15,145)
Comprehensive income attributable to the Company	73,433	98,045	196,726	228,567
Interest Rate Swap [Member]
Other comprehensive income:
Change in unrealized gain on interest rate swaps, net		$ 31		$ 403