Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Redeemable Common Stock [Member]	Limited Partner [Member]	Limited Partner [Member]	General Partner [Member]	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Distributions in Excess Of Net Income [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	AOCI Attributable to Noncontrolling Interest [Member]	Noncontrolling Interests Operating Partnership [Member]	Noncontrolling Interests-Consolidated Real Estate Entities [Member]
Beginning Balance at Dec. 31, 2018	$ 6,372,189	$ 9,414				$ 9	$ 1,136	$ 7,138,170	$ (989,263)	$ (212)		$ 220,043	$ 2,306
Beginning Balance, Shares at Dec. 31, 2018						868,000	113,746,000
Net income	366,618		$ 366,618	$ 12,671					353,811			12,671	136
Other comprehensive Income (loss) - derivative instruments	(13,423)									(12,966)	$ (13,423)	(457)
Issuance and registration of common shares	20,500	1,651					$ 4	20,496
Issuance and registration of common shares, Shares							338,000
Shares repurchased and retired	(3,724)				$ (3,724)			(3,724)
Shares repurchased and retired, Shares							(37,000)
Exercise of stock options	2,881				2,881			2,881
Exercise of stock options, Shares							48,000
Shares issued in exchange for common units								2,366				(2,366)
Shares issued in exchange for common units, Shares							44,000
Shares issued in exchange for redeemable stock	575	(575)			575			575
Redeemable stock fair market value adjustment	(3,641)	3,641			(3,641)				(3,641)
Adjustment for noncontrolling interests in Operating Partnership	6,126			359	(359)			(816)				816	6,126
Amortization of unearned compensation	14,684							14,684
Dividends on preferred stock	(3,688)								(3,688)
Dividends on common stock	(442,698)								(442,698)
Dividends on noncontrolling interests units	(16,060)											(16,060)
Acquisition of noncontrolling interest	(10,880)				(8,559)			(8,559)					(2,321)
Contributions from noncontrolling interest													6,126
Ending Balance at Dec. 31, 2019	6,289,459	14,131				$ 9	$ 1,140	7,166,073	(1,085,479)	(13,178)		214,647	6,247
Ending Balance, Shares at Dec. 31, 2019						868,000	114,139
Partners' Capital at Dec. 31, 2018	6,372,170	9,414		220,043	6,083,142				66,840		(161)		2,306
Net Income (Loss) Allocated to General Partners					350,123
Dividends, Preferred Stock, Cash	3,688								3,688
Issuance of units	20,500	1,651			20,500
General partner units issued in exchange for limited partner units				(2,366)	2,366
Amortization of unearned compensation	14,684				14,684
Dividends, Preferred Stock, Cash	(3,688)		(3,688)
Distributions to common unitholders	(458,758)			16,060	(442,698)
Partners' Capital at Dec. 31, 2019	6,289,440	14,131		214,647	6,015,290				66,840		(13,584)		6,247
Net income	264,015		264,015	9,053					254,962			9,053
Other comprehensive Income (loss) - derivative instruments	1,088									1,050	1,088	38
Issuance and registration of common shares	(208)	1,629					$ 1	(209)
Issuance and registration of common shares, Shares							157,000
Shares repurchased and retired	(5,657)				(5,657)			(5,657)
Shares repurchased and retired, Shares							(55,000)
Exercise of stock options	71				71			71
Exercise of stock options, Shares							1
Shares issued in exchange for common units								502				(502)
Shares issued in exchange for common units, Shares							10,000
Redeemable stock fair market value adjustment	363	(363)			363				363
Adjustment for noncontrolling interests in Operating Partnership	3,601			63	(63)			(25)				25	3,601
Amortization of unearned compensation	16,038							16,038
Dividends on preferred stock	(3,688)								(3,688)
Dividends on common stock	(460,340)								(460,340)
Dividends on noncontrolling interests units	(16,334)											(16,334)
Contributions from noncontrolling interest	3,601												3,601
Ending Balance at Dec. 31, 2020	6,088,408	15,397	6,088,389			$ 9	$ 1,141	7,176,793	(1,294,182)	(12,128)		206,927	9,848
Ending Balance, Shares at Dec. 31, 2020						868,000	114,252,000
Net Income (Loss) Allocated to General Partners					251,274
Dividends, Preferred Stock, Cash	3,688								3,688
Issuance of units	(208)	1,629			(208)
General partner units issued in exchange for limited partner units				(502)	502
Partners' Capital at Dec. 31, 2020	6,088,389	15,397		206,927	5,817,270				66,840		(12,496)		9,848
Amortization of unearned compensation	16,038				16,038
Dividends, Preferred Stock, Cash	(3,688)		(3,688)
Distributions to common unitholders	(476,674)			(16,334)	(460,340)
Net income	550,702		550,702	16,911					533,791			16,911
Other comprehensive Income (loss) - derivative instruments	1,114									996	1,114	118
Issuance and registration of common shares	(429)	1,657					$ 2	(431)
Issuance and registration of common shares, Shares							147,000
Shares repurchased and retired	(9,043)				(9,043)			(9,043)
Shares repurchased and retired, Shares							(64,000)
Exercise of stock options	$ 1,478				1,478			1,478
Exercise of stock options, Shares	19,032						19,000
Shares issued in exchange for common units							$ 8	43,284				(43,292)
Shares issued in exchange for common units, Shares							851,000
Redeemable stock fair market value adjustment	$ (13,131)	13,131			(13,131)				(13,131)
Adjustment for noncontrolling interests in Operating Partnership	13,766			(605)	605			723				(723)	13,766
Amortization of unearned compensation	18,152							18,152
Dividends on preferred stock	(3,688)								(3,688)
Dividends on common stock	(478,597)								(478,597)
Dividends on noncontrolling interests units	(14,825)											(14,825)
Contributions from noncontrolling interest	13,766												13,766
Ending Balance at Dec. 31, 2021	6,153,907	30,185	6,153,888			$ 9	$ 1,151	$ 7,230,956	(1,255,807)	$ (11,132)		$ 165,116	23,614
Ending Balance, Shares at Dec. 31, 2021						868,000	115,205,000
Net Income (Loss) Allocated to General Partners					530,103
Dividends, Preferred Stock, Cash	3,688								3,688
Issuance of units	(429)	1,657			(429)
General partner units issued in exchange for limited partner units				(43,292)	43,292
Partners' Capital at Dec. 31, 2021	6,153,888	$ 30,185		165,116	5,909,700				$ 66,840		$ (11,382)		$ 23,614
Amortization of unearned compensation	18,152				18,152
Dividends, Preferred Stock, Cash	(3,688)		$ (3,688)
Distributions to common unitholders	$ (493,422)			$ (14,825)	$ (478,597)