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Condensed Consolidated Statement of Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Distributions in Excess of Accumulated Earnings [Member]	Accumulated Other Comprehensive Loss, Net [Member]	Noncontrolling Interest [Member]
Issuance of common stock under:
Cumulative effect upon adoption of ASU \| ASU 2016-01 [Member]	$ 0			$ 2,234	$ (2,234)
Cumulative effect upon adoption of ASU \| ASU 2017-05 [Member]	123,708			119,651		$ 4,057
Balance at period beginning at Dec. 31, 2017	6,396,825	$ 7	$ 7,129,571	(833,726)	(18,446)	119,419
Balances (in shares) at Dec. 31, 2017		66,054
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	203,049			191,358		11,691
Reversal of unrealized gains upon the sale of marketable debt securities	2				2
Change in fair value of derivatives and amortization of swap settlements	9,656				9,335	321
Change in fair value of marketable debt securities, net	(99)				(95)	(4)
Issuance of common stock under:
Stock option and restricted stock plans, net	1,864	$ 0	1,864
Stock option and restricted stock plans, net (in shares)		12
Sale of common stock, net	(353)		(353)
Equity based compensation costs	6,814		6,201			613
Retirement of common stock, net	(3,774)	$ 0	(3,774)
Retirement of common stock, net (in shares)		(17)
Changes in the redemption value of redeemable noncontrolling interest	(1,845)		(1,646)			(199)
Distributions to noncontrolling interest	(15,397)					(15,397)
Redemptions of noncontrolling interest	(57)	$ 0	(54)			(3)
Redemptions of noncontrolling interest (in shares)		1
Common stock dividends	(245,710)			(245,710)
Balance at period end at Jun. 30, 2018	6,474,683	$ 7	7,131,809	(766,193)	(11,438)	120,498
Balances (in shares) at Jun. 30, 2018		66,050
Balance at period beginning at Mar. 31, 2018	6,492,159	$ 7	7,127,248	(743,773)	(14,709)	123,386
Balances (in shares) at Mar. 31, 2018		66,044
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	106,410			100,440		5,970
Reversal of unrealized gains upon the sale of marketable debt securities	3				3
Change in fair value of derivatives and amortization of swap settlements	3,402				3,289	113
Change in fair value of marketable debt securities, net	(22)				(21)	(1)
Issuance of common stock under:
Stock option and restricted stock plans, net	642	$ 0	642
Stock option and restricted stock plans, net (in shares)		5
Sale of common stock, net	(286)		(286)
Equity based compensation costs	4,284		3,948			336
Changes in the redemption value of redeemable noncontrolling interest	108		311			(203)
Distributions to noncontrolling interest	(9,100)					(9,100)
Redemptions of noncontrolling interest	(57)	$ 0	(54)			(3)
Redemptions of noncontrolling interest (in shares)		1
Common stock dividends	(122,860)			(122,860)
Balance at period end at Jun. 30, 2018	6,474,683	$ 7	7,131,809	(766,193)	(11,438)	120,498
Balances (in shares) at Jun. 30, 2018		66,050
Issuance of common stock under:
Cumulative effect upon adoption of ASU					175
Cumulative effect upon adoption of ASU \| ASU 2017-12 [Member]	181				175	6
Balance at period beginning at Dec. 31, 2018	6,393,844	$ 7	7,093,079	(812,796)	(13,217)	126,771
Balances (in shares) at Dec. 31, 2018		65,890
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	223,566			211,133		12,433
Reversal of unrealized gains upon the sale of marketable debt securities	(32)				(31)	(1)
Change in fair value of derivatives and amortization of swap settlements	(6,354)				(6,140)	(214)
Change in fair value of marketable debt securities, net	228				221	7
Issuance of common stock under:
Stock option and restricted stock plans, net	5,228	$ 0	5,228
Stock option and restricted stock plans, net (in shares)		62
Sale of common stock, net	(82)		(82)
Equity based compensation costs	6,100		5,472			628
Retirement of common stock, net	(56,989)	$ 0	(56,989)
Retirement of common stock, net (in shares)		(234)
Changes in the redemption value of redeemable noncontrolling interest	(1,428)		(2,739)			1,311
Changes in noncontrolling interest from acquisition	65,472					65,472
Distributions to noncontrolling interest	(14,108)					(14,108)
Redemptions of noncontrolling interest	(14,179)		(12,083)			(2,096)
Redemptions of noncontrolling interest (in shares)		9
Common stock dividends	(256,331)			(256,331)
Balance at period end at Jun. 30, 2019	6,345,116	$ 7	7,031,886	(857,994)	(18,992)	190,209
Balances (in shares) at Jun. 30, 2019		65,727
Balance at period beginning at Mar. 31, 2019	6,317,195	$ 7	7,028,154	(822,087)	(14,817)	125,938
Balances (in shares) at Mar. 31, 2019		65,716
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	98,061			92,275		5,786
Reversal of unrealized gains upon the sale of marketable debt securities	(65)				(63)	(2)
Change in fair value of derivatives and amortization of swap settlements	(4,361)				(4,214)	(147)
Change in fair value of marketable debt securities, net	105				102	3
Issuance of common stock under:
Stock option and restricted stock plans, net	2,024	$ 0	2,024
Stock option and restricted stock plans, net (in shares)		11
Sale of common stock, net	(62)		(62)
Equity based compensation costs	3,500		3,171			329
Changes in the redemption value of redeemable noncontrolling interest	339		288			51
Changes in noncontrolling interest from acquisition	65,472					65,472
Distributions to noncontrolling interest	(6,944)					(6,944)
Redemptions of noncontrolling interest	(1,966)		(1,689)			(277)
Common stock dividends	(128,182)			(128,182)
Balance at period end at Jun. 30, 2019	$ 6,345,116	$ 7	$ 7,031,886	$ (857,994)	$ (18,992)	$ 190,209
Balances (in shares) at Jun. 30, 2019		65,727