Equity (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Changes in equity
Beginning Balance			$ 9,840,526
Net income attributable to common stockholders	$ 356,392	$ 206,142	791,767	$ 586,610
Income (loss) on cash flow hedges	719	(31)	(73,826)	(67)
Cash flow hedge loss reclassified to earnings	1,748	$ 1,373	4,682	4,401
Change in redemption value of redeemable noncontrolling interest			(529)
Dividends declared to common stockholders			(555,916)
Issuance of common stock, net of withholdings			9,861
Amortization of deferred compensation			20,059
Ending Balance	10,036,624		10,036,624
Common stock
Changes in equity
Beginning Balance			1,370
Issuance of common stock, net of withholdings			3
Ending Balance	1,373		1,373
Additional paid-in capital
Changes in equity
Beginning Balance			10,068,532
Issuance of common stock, net of withholdings			11,148
Amortization of deferred compensation			20,059
Ending Balance	10,099,739		10,099,739
Accumulated earnings less dividends
Changes in equity
Beginning Balance			(197,989)
Net income attributable to common stockholders			791,767
Change in redemption value of redeemable noncontrolling interest			(529)	$ 1,722
Dividends declared to common stockholders			(555,916)
Issuance of common stock, net of withholdings			(1,290)
Ending Balance	36,043		36,043
Accumulated other comprehensive loss
Changes in equity
Beginning Balance			(31,387)
Income (loss) on cash flow hedges			(73,826)
Cash flow hedge loss reclassified to earnings			4,682
Ending Balance	$ (100,531)		$ (100,531)