Equity (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Changes in equity
Beginning Balance			$ 10,171,416
Net income attributable to common stockholders	$ 238,248	$ 356,392	639,348	$ 791,767
Income (loss) on cash flow hedges	359	719	(15,654)	(73,826)
Cash flow hedge loss reclassified to earnings	1,767	$ 1,748	5,301	4,682
Change in redemption value of redeemable noncontrolling interest			(458)
Dividends declared to common stockholders			(587,819)
Issuance of common stock, net of withholdings			99,310
Amortization of deferred compensation			22,369
Ending Balance	10,333,813		10,333,813
Common stock
Changes in equity
Beginning Balance			1,373
Issuance of common stock, net of withholdings			8
Ending Balance	1,381		1,381
Additional paid-in capital
Changes in equity
Beginning Balance			10,105,654
Issuance of common stock, net of withholdings			100,625
Amortization of deferred compensation			22,369
Ending Balance	10,228,648		10,228,648
Accumulated earnings less dividends
Changes in equity
Beginning Balance			94,899
Net income attributable to common stockholders			639,348
Change in redemption value of redeemable noncontrolling interest			(458)	$ 529
Dividends declared to common stockholders			(587,819)
Issuance of common stock, net of withholdings			(1,323)
Ending Balance	144,647		144,647
Accumulated other comprehensive loss
Changes in equity
Beginning Balance			(30,510)
Income (loss) on cash flow hedges			(15,654)
Cash flow hedge loss reclassified to earnings			5,301
Ending Balance	$ (40,863)		$ (40,863)