Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net income	$ 386,138	$ 900,143	$ 435,880
Other comprehensive income:
Change in unrealized gain on marketable securities	8	(45,799)	20,202
Change in unrealized loss on interest rate swaps	451	(22)	(1,404)
Change in foreign currency translation adjustment	(281)	6,287	96,895
Other comprehensive income/(loss)	178	(39,534)	115,693
Comprehensive income	386,316	860,609	551,573
Comprehensive income attributable to noncontrolling interests	(7,288)	(6,028)	(17,468)
Comprehensive income attributable to the Company	379,028	854,581	534,105
Interest Rate Swap [Member]
Other comprehensive income:
Change in unrealized loss on interest rate swaps	$ 451	$ (22)	$ (1,404)