Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 127,609	$ 91,950	$ 440,348	$ 187,810
Other comprehensive income:
Change in unrealized gain on marketable securities, net	(54,265)	$ 11,789	(38,547)	$ 8,111
Change in unrealized gain on interest rate swaps	406		55
Change in foreign currency translation adjustment, net	997	$ 5,493	(8,536)	$ (2,896)
Other comprehensive (loss)/income	(52,862)	17,282	(47,028)	5,215
Comprehensive income	74,747	109,232	393,320	193,025
Comprehensive income attributable to noncontrolling interests	(609)	(2,441)	(3,006)	(11,123)
Comprehensive income attributable to the Company	$ 74,138	$ 106,791	$ 390,314	$ 181,902