CONSOLIDATED STATEMENTS OF CHANGES IN OWNERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total Stockholders' Equity [Member] Omega OP Scenario, Previously Reported [Member]	Total Stockholders' Equity [Member] Omega OP	Total Stockholders' Equity [Member]	Noncontrolling Interest Omega OP	Noncontrolling Interest	General Partner Omega OP Scenario, Previously Reported [Member]	General Partner Omega OP	Limited Partner Omega OP Scenario, Previously Reported [Member]	Limited Partner Omega OP	Omega OP Scenario, Previously Reported [Member]	Omega OP	Total
Balance, beginning at Dec. 31, 2016		$ 4,211,986					$ 3,858,745		$ 353,241		$ 4,211,986
Balance (in units) at Dec. 31, 2016							196,142		8,862		205,004
Increase (Decrease) in Partners' Capital [Roll Forward]
Contributions from partners		75,111					$ 75,111				$ 75,111
Contributions from partners (in units)							2,167				2,167
Distributions to partners		(525,487)					$ (502,861)		$ (22,626)		$ (525,487)
Omega OP Unit conversions		(2,990)							$ (2,990)		$ (2,990)
Omega OP Unit conversions (in units)									(90)		(90)
Comprehensive income:
Foreign currency translation		21,845	$ 20,916		$ 929		20,916		$ 929		$ 21,845	$ 21,845
Cash flow hedges		2,883	2,761		122		2,761		122		2,883	2,883
Net income		104,910	100,419		4,491		100,419		4,491		104,910	104,910
Total comprehensive income		129,638									129,638	129,638
Balance, ending at Dec. 31, 2017	$ 3,888,258	3,898,258				$ 3,555,091	$ 3,564,668	$ 333,167	$ 333,590	$ 3,888,258	$ 3,898,258
Balance (in units) at Dec. 31, 2017						198,309	198,309	8,772	8,772	207,081	207,081
Increase (Decrease) in Partners' Capital [Roll Forward]
Cumulative effect of accounting change (see Note 2)		10,000	9,577		423		$ 9,577		$ 423		$ 10,000	10,000
Contributions from partners		138,646					$ 138,646				$ 138,646
Contributions from partners (in units)							4,037				4,037
Distributions to partners		(552,442)					$ (528,949)		(23,493)		$ (552,442)
Omega OP Unit conversions		(1,861)							$ (1,861)		$ (1,861)
Omega OP Unit conversions (in units)									(58)		(58)
Comprehensive income:
Foreign currency translation		(14,532)	(13,924)		(608)		(13,924)		$ (608)		$ (14,532)	(14,532)
Cash flow hedges		2,531	2,422		109		2,422		109		2,531	2,531
Net income		293,884	281,578		12,306		281,578		12,306		293,884	293,884
Total comprehensive income		281,883									281,883	281,883
Balance, ending at Dec. 31, 2018		3,764,484					$ 3,444,441		$ 320,043		$ 3,764,484
Balance (in units) at Dec. 31, 2018							202,346		8,714		211,060
Increase (Decrease) in Partners' Capital [Roll Forward]
Cumulative effect of accounting change (see Note 2)		(8,490)					$ (8,198)		$ (292)		$ (8,490)
Contributions from partners		927,265					$ 927,265				$ 927,265
Contributions from partners (in units)							24,285				24,285
Distributions to partners		(585,643)					$ (564,349)		(21,294)		$ (585,643)
Vesting/exercising of Omega OP Units							(6,648)		$ 6,648
Vesting/exercising of Omega OP Units (in units)									173		173
Noncontrolling interest - consolidated joint venture				$ 228	228						$ 228	228
Omega OP Unit conversions		(114,948)							$ (114,948)		$ (114,948)
Omega OP Unit conversions (in units)									(2,956)		(2,956)
Comprehensive income:
Foreign currency translation		8,114	7,931		183		7,931		$ 183		$ 8,114	8,114
Cash flow hedges		(6,363)	(6,137)		(226)		(6,137)		(226)		(6,363)	(6,363)
Net income		351,959	341,123	(12)	10,824		341,123		10,836		351,947	351,947
Total comprehensive income		353,710									353,698	353,698
Balance, ending at Dec. 31, 2019		$ 4,336,378		$ 216			$ 4,135,428		$ 200,950		$ 4,336,594
Balance (in units) at Dec. 31, 2019							226,631		5,931		232,562
Increase (Decrease) in Partners' Capital [Roll Forward]
Cumulative effect of accounting change (see Note 2)			$ (8,198)		$ (292)							$ (8,490)