Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Interest Rate Swap [Member]
Other comprehensive income:
Change in unrealized loss on interest rate swaps	$ (604)	$ (352)
Net income	142,154	312,739
Change in unrealized gain on marketable securities	2	15,718
Change in unrealized loss on interest rate swaps	(604)	(352)
Change in foreign currency translation adjustment, net	2,510	(9,532)
Other comprehensive income:	1,908	5,834
Comprehensive income	144,062	318,573
Comprehensive income attributable to noncontrolling interests	(1,441)	(2,397)
Comprehensive income attributable to the Company	$ 142,621	$ 316,176