Equity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Changes in equity
Beginning Balance	$ 10,388,046
Net income attributable to common stockholders	141,643	$ 235,875
Gain on cash flow hedges	11,501	145
Cash flow hedge losses reclassified to earnings	1,756	1,752
Change in redemption value of redeemable noncontrolling interest	(63)
Dividends declared to common stockholders	(203,166)
Issuance of common stock, net of withholdings	(11,142)
Amortization of deferred compensation	6,549
Ending Balance	10,335,124
Common stock
Changes in equity
Beginning Balance	1,381
Issuance of common stock, net of withholdings	1
Ending Balance	1,382
Additional paid-in capital
Changes in equity
Beginning Balance	10,235,475
Issuance of common stock, net of withholdings	(12,286)
Amortization of deferred compensation	6,549
Ending Balance	10,229,738
Accumulated earnings less dividends
Changes in equity
Beginning Balance	188,609
Net income attributable to common stockholders	141,643
Change in redemption value of redeemable noncontrolling interest	(63)	$ 183
Dividends declared to common stockholders	(203,166)
Issuance of common stock, net of withholdings	1,143
Ending Balance	128,166
Accumulated other comprehensive loss
Changes in equity
Beginning Balance	(37,419)
Gain on cash flow hedges	11,501
Cash flow hedge losses reclassified to earnings	1,756
Ending Balance	$ (24,162)