Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income		$ 89,299	$ 354,741	$ 630,356	$ 730,961
Other comprehensive income (loss):
Unrecognized gain (loss) on equity investments		(3,808)	5,908	(20,285)	(5,252)
Unrecognized gain (loss) on cash flow hedges		2	401	2	1,371
Unrecognized actuarial gain/(loss)		0	(2)	0	0
Foreign currency translation gain (loss)		37,343	516	70,769	(48,496)
Total other comprehensive income (loss)		33,537	6,823	50,486	(52,377)
Total comprehensive income (loss), total		122,836	361,564	680,842	678,584
Total comprehensive income (loss) attributable to noncontrolling interests	[1]	14,732	1,846	29,930	13,117
Comprehensive income (loss) attributable to controlling interests		$ 108,104	$ 359,718	$ 650,912	$ 665,467

[1] Includes amounts attributable to redeemable noncontrolling interests.