Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income		$ 337,610	$ 165,474
Other comprehensive income (loss):
Unrecognized gain (loss) on equity investments		(10,569)	(7,549)
Unrecognized gain (loss) on cash flow hedges		0	483
Unrecognized actuarial gain/(loss)		0	2
Unrecognized gain (loss) on foreign currency translation		5,713	1,372
Total other comprehensive income (loss)		(4,856)	(5,692)
Total comprehensive income (loss), total		332,754	159,782
Total comprehensive income (loss) attributable to noncontrolling interests	[1]	3,636	15,271
Comprehensive income (loss) attributable to controlling interests		$ 329,118	$ 144,511

[1] Includes amounts attributable to redeemable noncontrolling interests.