CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities
Net income	$ 293,884	$ 104,910	$ 383,367
Adjustment to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	281,279	287,591	267,062
Impairment on real estate properties	35,014	99,070	58,726
Impairment loss on direct financing leases	27,168	198,199
Provision for uncollectible accounts	6,689	14,580	9,845
Interest - amortization of deferred financing costs and refinancing costs	8,960	19,711	11,458
Accretion of direct financing leases	109	(6,107)	(12,157)
Stock-based compensation expense	15,987	15,212	13,790
Gain on assets sold - net	(24,774)	(53,912)	(50,208)
Amortization of acquired in-place leases - net	(10,707)	(11,910)	(13,991)
Effective yield receivable on mortgage notes	(1,068)	(1,924)	(721)
Interest paid-in-kind	(6,360)
Change in operating assets and liabilities - net:
Contractual receivables	2,368	(36,621)	(4,876)
Straight-line rent receivables	(61,559)	(25,240)	(42,091)
Lease inducements	(32,738)	(8,419)	2,589
Other operating assets and liabilities	(34,879)	(17,228)	1,980
Net cash provided by operating activities	499,373	577,912	624,773
Cash flows from investing activities
Acquisition of real estate	(105,119)	(385,418)	(959,748)
Net proceeds from sale of real estate investments	309,586	257,812	169,603
Cash acquired in acquisition		2,341
Investments in construction in progress	(139,441)	(86,689)	(68,983)
Investments in direct financing leases		(7,183)	(2,080)
Proceeds from sale of direct financing lease	20,979	33,306
Placement of mortgage loans	(65,340)	(34,643)	(48,722)
Collection of mortgage principal	26,088	1,529	59,975
Investments in unconsolidated joint venture			(50,032)
Distributions from unconsolidated joint venture in excess of earnings	5,471	12,175	1,318
Capital improvements to real estate investments	(29,824)	(37,766)	(40,471)
Receipts from insurance proceeds	8,717	2,754
Investments in other investments	(385,707)	(139,047)	(271,557)
Proceeds from other investments	181,371	95,696	96,789
Net cash used in investing activities	(173,219)	(285,133)	(1,113,908)
Cash flows from financing activities
Proceeds from credit facility borrowings	1,291,000	1,687,000	1,304,000
Payments on credit facility borrowings	(1,268,000)	(1,587,000)	(1,344,000)
Receipts of other long-term borrowings		1,346,749	1,048,173
Payments of other long-term borrowings	(2,049)	(1,252,788)	(181,249)
Payments of financing related costs	(8)	(29,198)	(11,830)
Receipts from dividend reinvestment plan	46,801	36,722	240,041
Payments for exercised options and restricted stock	(1,654)	(2,143)	(23,426)
Net proceeds from issuance of common stock	75,532	22,120	19,651
Dividends paid	(528,696)	(502,603)	(453,152)
Redemption of Omega OP Units	(134)	(48)	(733)
Distributions to Omega OP Unit Holders	(23,493)	(22,626)	(21,179)
Net cash (used in) provided by financing activities	(410,701)	(303,815)	576,296
Effect of foreign currency translation on cash, cash equivalents and restricted cash	(590)	568	84
(Decrease) increase in cash, cash equivalents and restricted cash	(85,137)	(10,468)	87,245
Cash, cash equivalents and restricted cash at beginning of year	96,808	107,276	20,031
Cash, cash equivalents and restricted cash at end of year	11,671	96,808	107,276
Omega OP
Cash flows from operating activities
Net income	293,884	104,910	383,367
Adjustment to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	281,279	287,591	267,062
Impairment on real estate properties	35,014	99,070	58,726
Impairment loss on direct financing leases	27,168	198,199
Provision for uncollectible accounts	6,689	14,580	9,845
Interest - amortization of deferred financing costs and refinancing costs	8,960	19,711	11,458
Accretion of direct financing leases	109	(6,107)	(12,157)
Stock-based compensation expense	15,987	15,212	13,790
Gain on assets sold - net	(24,774)	(53,912)	(50,208)
Amortization of acquired in-place leases - net	(10,707)	(11,910)	(13,991)
Effective yield receivable on mortgage notes	(1,068)	(1,924)	(721)
Interest paid-in-kind	(6,360)
Change in operating assets and liabilities - net:
Contractual receivables	2,368	(36,621)	(4,876)
Straight-line rent receivables	(61,559)	(25,240)	(42,091)
Lease inducements	(32,738)	(8,419)	2,589
Other operating assets and liabilities	(34,879)	(17,228)	1,980
Net cash provided by operating activities	499,373	577,912	624,773
Cash flows from investing activities
Acquisition of real estate	(105,119)	(385,418)	(959,748)
Net proceeds from sale of real estate investments	309,586	257,812	169,603
Cash acquired in acquisition		2,341
Investments in construction in progress	(139,441)	(86,689)	(68,983)
Investments in direct financing leases		(7,183)	(2,080)
Proceeds from sale of direct financing lease	20,979	33,306
Placement of mortgage loans	(65,340)	(34,643)	(48,722)
Collection of mortgage principal	26,088	1,529	59,975
Investments in unconsolidated joint venture			(50,032)
Distributions from unconsolidated joint venture in excess of earnings	5,471	12,175	1,318
Capital improvements to real estate investments	(29,824)	(37,766)	(40,471)
Receipts from insurance proceeds	8,717	2,754
Investments in other investments	(385,707)	(139,047)	(271,557)
Proceeds from other investments	181,371	95,696	96,789
Net cash used in investing activities	(173,219)	(285,133)	(1,113,908)
Cash flows from financing activities
Proceeds from intercompany loans payable from Omega	1,291,000	3,033,749	2,352,173
Repayment of intercompany loans payable to Omega	(1,270,049)	(2,839,788)	(1,525,249)
Payment of financing related costs incurred by Omega	(8)	(29,198)	(11,830)
Equity contributions from general partners	120,679	56,699	236,266
Distributions to general partners	(528,696)	(502,603)	(453,152)
Distributions to limited partners	(23,493)	(22,626)	(21,179)
Redemption of Omega OP Units	(134)	(48)	(733)
Net cash (used in) provided by financing activities	(410,701)	(303,815)	576,296
Effect of foreign currency translation on cash, cash equivalents and restricted cash	(590)	568	84
(Decrease) increase in cash, cash equivalents and restricted cash	(85,137)	(10,468)	87,245
Cash, cash equivalents and restricted cash at beginning of year	96,808	107,276	20,031
Cash, cash equivalents and restricted cash at end of year	$ 11,671	$ 96,808	$ 107,276