Equity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Changes in equity
Beginning Balance	$ 10,171,416
Net income attributable to common stockholders	235,875	$ 237,931
(Loss) income on cash flow hedges	145	(47,757)
Cash flow hedge loss reclassified to earnings	1,752	1,374
Change in redemption value of redeemable noncontrolling interest	(183)
Dividends declared to common stockholders	(195,657)
Issuance of common stock, net of withholdings	46,707
Amortization of deferred compensation	6,567
Ending Balance	10,266,622
Common stock
Changes in equity
Beginning Balance	1,373
Issuance of common stock, net of withholdings	5
Ending Balance	1,378
Additional paid-in capital
Changes in equity
Beginning Balance	10,105,654
Issuance of common stock, net of withholdings	47,962
Amortization of deferred compensation	6,567
Ending Balance	10,160,183
Accumulated earnings less dividends
Changes in equity
Beginning Balance	94,899
Net income attributable to common stockholders	235,875
Change in redemption value of redeemable noncontrolling interest	(183)	$ 299
Dividends declared to common stockholders	(195,657)
Issuance of common stock, net of withholdings	(1,260)
Ending Balance	133,674
Accumulated other comprehensive loss
Changes in equity
Beginning Balance	(30,510)
(Loss) income on cash flow hedges	145
Cash flow hedge loss reclassified to earnings	1,752
Ending Balance	$ (28,613)