CONSOLIDATED STATEMENTS OF CHANGES IN OWNERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Omega OP General Partner Scenario, Previously Reported [Member]	Omega OP General Partner Restatement Adjustment [Member]	Omega OP General Partner	Omega OP Limited Partner Scenario, Previously Reported [Member]	Omega OP Limited Partner Restatement Adjustment [Member]	Omega OP Limited Partner	Omega OP Scenario, Previously Reported [Member]	Omega OP Restatement Adjustment [Member]	Omega OP	Restatement Adjustment [Member]	Total
Balance at Dec. 31, 2015			$ 3,737,986			$ 362,879			$ 4,100,865
Balance (in units) at Dec. 31, 2015			187,399			8,956			196,355
Increase (Decrease) in Partners' Capital [Roll Forward]
Contributions from partners			$ 252,818						$ 252,818
Contributions from partners (in units)			8,743						8,743
Distributions to partners			$ (453,349)			$ (21,179)			$ (474,528)
Omega OP Unit redemptions			(10)			$ (3,289)			$ (3,299)
Omega OP Unit redemptions (in units)						(94)			(94)
Comprehensive income:
Foreign currency translation			(44,468)			$ (2,067)			$ (46,535)		$ (46,535)
Cash flow hedges			(647)			(55)			(702)		(702)
Net income			366,415			16,952			383,367		383,367
Total comprehensive income									336,130		336,130
Balance at Dec. 31, 2016			$ 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
Contributions from partners (in units)			2,167						2,167
Distributions to partners			$ (502,861)			$ (22,626)			$ (525,487)
Omega OP Unit redemptions						$ (2,990)			$ (2,990)
Omega OP Unit redemptions (in units)						(90)			(90)
Comprehensive income:
Foreign currency translation			20,916			$ 929			$ 21,845		21,845
Cash flow hedges			2,761			122			2,883		2,883
Net income			100,419			4,491			104,910		104,910
Total comprehensive income									129,638		129,638
Balance at Dec. 31, 2017	$ 3,555,091	$ 3,564,668		$ 333,167	$ 333,590		$ 3,888,258	$ 3,898,258	3,888,258
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)		$ 9,577			$ 423			$ 10,000		$ 10,000
Contributions from partners			$ 138,646						$ 138,646
Contributions from partners (in units)			4,037						4,037
Distributions to partners			$ (528,949)			(23,493)			$ (552,442)
Omega OP Unit redemptions						$ (1,861)			$ (1,861)
Omega OP Unit redemptions (in units)						(58)			(58)
Comprehensive income:
Foreign currency translation			(13,924)			$ (608)			$ (14,532)		(14,532)
Cash flow hedges			2,422			109			2,531		2,531
Net income			281,578			12,306			293,884		293,884
Total comprehensive income									281,883		$ 281,883
Balance at Dec. 31, 2018			$ 3,444,441			$ 320,043			$ 3,764,484
Balance (in units) at Dec. 31, 2018			202,346			8,714			211,060