Equity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Changes in equity
Beginning Balance			$ 10,171,416
Net income attributable to common stockholders	$ 165,225	$ 197,444	401,100	$ 435,377
Loss on cash flow hedges	(16,158)	(26,788)	(16,013)	(74,545)
Cash flow hedge loss reclassified to earnings	1,781	$ 1,561	3,534	2,935
Change in redemption value of redeemable noncontrolling interest			(397)
Dividends declared to common stockholders			(391,735)
Issuance of common stock, net of withholdings			99,339
Amortization of deferred compensation			15,168
Ending Balance	10,282,412		10,282,412
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			100,652
Amortization of deferred compensation			15,168
Ending Balance	10,221,474		10,221,474
Accumulated earnings less dividends
Changes in equity
Beginning Balance			94,899
Net income attributable to common stockholders			401,100
Change in redemption value of redeemable noncontrolling interest			(397)	$ 375
Dividends declared to common stockholders			(391,735)
Issuance of common stock, net of withholdings			(1,321)
Ending Balance	102,546		102,546
Accumulated other comprehensive loss
Changes in equity
Beginning Balance			(30,510)
Loss on cash flow hedges			(16,013)
Cash flow hedge loss reclassified to earnings			3,534
Ending Balance	$ (42,989)		$ (42,989)