Equity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Class of Stock [Line Items]
Common Stock, Dividends, Per Share, Declared	$ 1.52	$ 1.47
Changes in equity
Beginning Balance	$ 10,632,606	$ 10,388,046
Net income attributable to common stockholders	170,366	141,643
(Loss) gain on cash flow hedges	(7,231)	11,501
Cash flow hedge losses reclassified to earnings	1,468	1,756
Change in redemption value of redeemable noncontrolling interest	(224)	(63)
Dividends declared to common stockholders ($1.52 per share)	(212,166)	(203,166)
Issuance of common stock, net of withholdings	141,319	(11,142)
Amortization of deferred compensation	7,861	6,549
Ending Balance	10,733,999	10,335,124
Common stock
Changes in equity
Beginning Balance	1,385	1,381
Issuance of common stock, net of withholdings	9	1
Ending Balance	1,394	1,382
Additional paid-in capital
Changes in equity
Beginning Balance	10,306,588	10,235,475
Issuance of common stock, net of withholdings	143,202	(12,286)
Amortization of deferred compensation	7,861	6,549
Ending Balance	10,457,651	10,229,738
Accumulated earnings less dividends
Changes in equity
Beginning Balance	350,777	188,609
Net income attributable to common stockholders	170,366	141,643
Change in redemption value of redeemable noncontrolling interest	(224)	(63)
Dividends declared to common stockholders ($1.52 per share)	(212,166)	(203,166)
Issuance of common stock, net of withholdings	(1,892)	1,143
Ending Balance	306,861	128,166
Accumulated other comprehensive loss
Changes in equity
Beginning Balance	(26,144)	(37,419)
(Loss) gain on cash flow hedges	(7,231)	11,501
Cash flow hedge losses reclassified to earnings	1,468	1,756
Ending Balance	$ (31,907)	$ (24,162)