STOCKHOLDERS'/OWNERS' EQUITY (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		$ 3,888,258	$ 4,211,986	$ 4,100,865
Balance , ending		3,764,484	3,888,258	4,211,986
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Stockholders Equity/AOCI					$ 3,444,441	$ 3,555,091
Add: portion included in noncontrolling interest					320,043	333,167
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		3,888,258	4,211,986	4,100,865	3,764,484	3,888,258	$ 4,211,986
Foreign Currency Translation [Member] | Omega OP
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(26,033)	(54,948)	(8,413)
Translation (loss) gain		(21,703)	28,604	(46,303)
Realized gain (loss)		32	311	(232)
Balance , ending		(47,704)	(26,033)	(54,948)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		(26,033)	(54,948)	(8,413)	(47,704)	(26,033)	(54,948)
Cash Flow Hedges [Member] | Omega OP
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		1,463	(1,420)	(718)
Unrealized gain (loss)		2,469	545	(719)
Realized gain	[1]	62	2,338	17
Balance , ending		3,994	1,463	(1,420)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		1,463	(1,420)	(718)	3,994	1,463	(1,420)
Net Investment Hedge [Member] | Omega OP
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(7,070)	0	0
Unrealized gain (loss)		7,140	(7,070)	0
Balance , ending		70	(7,070)	0
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		(7,070)	0	0	70	(7,070)	0
Accumulated Other Comprehensive Loss
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			(53,827)	(8,712)
Balance , ending		(41,652)		(53,827)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Stockholders Equity/AOCI					(41,652)	(30,150)	(53,827)
Add: portion included in noncontrolling interest					1,988	1,490	2,541
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		(41,652)	(53,827)	(8,712)	(41,652)		(53,827)
Accumulated Other Comprehensive Loss | Omega OP
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	[2]	(31,640)	(56,368)
Balance , ending	[2]	(43,640)	(31,640)	(56,368)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	[2]	$ (31,640)	$ (56,368)	$ (56,368)	$ (43,640)	$ (31,640)	$ (56,368)

[1] Recorded in interest expense on the Consolidated Statements of Operations.

[2] These amounts are included in owners’ equity.