CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands	Total Stockholders' Equity [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Total Stockholders' Equity [Member] Cumulative Effect, Period of Adoption, Adjusted Balance [Member]	Total Stockholders' Equity [Member]	Common Stock Par Value Cumulative Effect, Period of Adoption, Adjusted Balance [Member]	Common Stock Par Value	Additional Paid-in Capital Cumulative Effect, Period of Adoption, Adjusted Balance [Member]	Additional Paid-in Capital	Cumulative Net Earnings [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Cumulative Net Earnings [Member] Cumulative Effect, Period of Adoption, Adjusted Balance [Member]	Cumulative Net Earnings [Member]	Cumulative Dividends Cumulative Effect, Period of Adoption, Adjusted Balance [Member]	Cumulative Dividends	Accumulated Other Comprehensive Loss. [Member] Cumulative Effect, Period of Adoption, Adjusted Balance [Member]	Accumulated Other Comprehensive Loss. [Member]	Noncontrolling Interest [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Noncontrolling Interest [Member] Cumulative Effect, Period of Adoption, Adjusted Balance [Member]	Noncontrolling Interest [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]	Cumulative Effect, Period of Adoption, Adjusted Balance [Member]	Total
Increase (Decrease) In Stockholders' Equity [Roll Forward]
Cumulative effect of accounting change (see Note 2)	$ (8,198)		$ 3,444,441		$ 20,235		$ 5,074,544	$ (8,198)		$ 2,130,511		$ (3,739,197)		$ (41,652)	$ (292)		$ 320,043	$ (8,490)		$ 3,764,484
Beginning balance at Dec. 31, 2018	(8,198)		3,444,441		20,235		5,074,544	(8,198)		2,130,511		(3,739,197)		(41,652)	(292)		320,043	(8,490)		3,764,484
Increase (Decrease) In Stockholders' Equity [Roll Forward]
Stock related compensation			15,093				15,093													15,093
Issuance of common stock			797,224		2,132		795,092													797,224
Common dividends declared			(564,349)									(564,349)								(564,349)
Vesting/exercising of OP units			(6,648)				(6,648)										6,648
Conversion and redemption of Omega OP Units to common stock			114,948		296		114,652										(114,948)
Omega OP Units distributions																	(21,294)			(21,294)
Other comprehensive income (loss)			1,794											1,794			(43)			1,751
Noncontrolling interest - consolidated joint venture																	228			228
Net income			341,123							341,123							10,824			351,947
Balance ending at Dec. 31, 2019	(28,028)	$ 4,107,400	4,135,428	$ 22,663	22,663	$ 5,992,733	5,992,733	(28,028)	$ 2,435,408	2,463,436	$ (4,303,546)	(4,303,546)	$ (39,858)	(39,858)	(757)	$ 200,409	201,166	(28,785)	$ 4,307,809	4,336,594
Increase (Decrease) In Stockholders' Equity [Roll Forward]
Cumulative effect of accounting change (see Note 2)	$ (28,028)	$ 4,107,400	4,135,428	$ 22,663	22,663	$ 5,992,733	5,992,733	$ (28,028)	$ 2,435,408	2,463,436	$ (4,303,546)	(4,303,546)	$ (39,858)	(39,858)	$ (757)	$ 200,409	201,166	$ (28,785)	$ 4,307,809	4,336,594
Stock related compensation			19,064				19,064													19,064
Issuance of common stock			151,861		452		151,409													151,861
Common dividends declared			(612,551)									(612,551)								(612,551)
Vesting/exercising of OP units			(11,551)				(11,551)										11,551
Conversion and redemption of Omega OP Units to common stock			1,236		4		1,232										(1,236)
Omega OP Units distributions																	(20,970)			(20,970)
Other comprehensive income (loss)			27,090											27,090			759			27,849
Net income			159,327							159,327							4,218			163,545
Balance ending at Dec. 31, 2020			3,841,876		23,119		6,152,887			2,594,735		(4,916,097)		(12,768)			194,731			4,036,607
Increase (Decrease) In Stockholders' Equity [Roll Forward]
Cumulative effect of accounting change (see Note 2)			3,841,876		23,119		6,152,887			2,594,735		(4,916,097)		(12,768)			194,731			4,036,607
Stock related compensation			21,578				21,578													21,578
Issuance of common stock			274,011		783		273,228													274,011
Common dividends declared			(637,811)									(637,811)								(637,811)
Vesting/exercising of OP units			(21,623)				(21,623)										21,623
Conversion and redemption of Omega OP Units to common stock			1,500		4		1,496										(1,579)			(79)
Omega OP Units distributions																	(25,229)			(25,229)
Other comprehensive income (loss)			10,568											10,568			279			10,847
Net income			416,739							416,739							11,563			428,302
Balance ending at Dec. 31, 2021			3,906,838		23,906		6,427,566			3,011,474		(5,553,908)		(2,200)			201,388			4,108,226
Increase (Decrease) In Stockholders' Equity [Roll Forward]
Cumulative effect of accounting change (see Note 2)			$ 3,906,838		$ 23,906		$ 6,427,566			$ 3,011,474		$ (5,553,908)		$ (2,200)			$ 201,388			$ 4,108,226