Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net income	$ 900,143	$ 435,880	$ 241,353
Other comprehensive income:
Change in unrealized gain on marketable securities	(45,799)	20,202	6,773
Change in unrealized loss on interest rate swaps	(22)	(1,404)
Change in foreign currency translation adjustment	6,287	96,895	(4,208)
Other comprehensive (loss)/income	(39,534)	115,693	2,565
Comprehensive income	860,609	551,573	243,918
Comprehensive income attributable to noncontrolling interests	(6,028)	(17,468)	(6,436)
Comprehensive income attributable to the Company	854,581	534,105	$ 237,482
Interest Rate Swap [Member]
Other comprehensive income:
Change in unrealized loss on interest rate swaps	$ (22)	$ (1,404)