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Segment Reporting (Schedule of Segments) (Details) $ in Thousands	1 Months Ended	3 Months Ended								6 Months Ended	12 Months Ended
	Jun. 30, 2018 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2019 USD ($) segments	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	May 31, 2019 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segments											4
Segment Profit (Loss)
Revenue		$ 128,888	$ 145,338	$ 98,468	$ 106,802	$ 140,165	$ 122,141	$ 171,571	$ 364,245		$ 479,496	$ 798,122	$ 679,202
Earnings (losses) from equity method investments											41,849	(5,007)	13,015
Selling profit from sales-type leases											180,416
Income from discontinued operations											0	0	4,939
Gain from discontinued operations											0	0	123,418
Gain on consolidation of equity method investment										$ 67,900	0	67,877	0
Income from sales of real estate	$ 24,500										236,623	126,004	92,049
Total revenue and other earnings											938,384	986,996	912,623
Other expense											(13,120)	(6,040)	(20,954)
Allocated interest expense											(183,919)	(183,751)	(194,686)
Allocated general and administrative											(68,173)	(74,572)	(80,070)
Segment profit (loss)											471,083	233,163	288,380
Other Significant Items
Recovery of loan losses											6,482	16,937	(5,828)
Impairment of assets											13,419	147,108	32,379
Depreciation and amortization											58,259	58,699	49,033
Capitalized expenditures											136,093	204,722	166,336
Segment Assets
Real estate, net		1,527,219				1,771,019					1,527,219	1,771,019
Real estate available and held for sale		8,650				22,551					8,650	22,551
Total real estate		1,535,869				1,793,570					1,535,869	1,793,570
Net investment in leases		418,915				0					418,915	0		$ 424,100
Land and development, net		580,545				598,218					580,545	598,218
Loans receivable and other lending investments, net		827,861				988,224					827,861	988,224
Other investments		907,875				304,275					907,875	304,275
Total portfolio assets		4,271,065				3,684,287					4,271,065	3,684,287
Cash and other assets		814,044				1,329,990					814,044	1,329,990
Total assets		5,085,109				5,014,277					5,085,109	5,014,277
Stock-based compensation expense											30,436	17,563	18,812
Operating Segments | Real Estate Finance
Segment Profit (Loss)
Earnings (losses) from equity method investments											0	0	0
Selling profit from sales-type leases											0
Income from discontinued operations													0
Gain from discontinued operations													0
Gain on consolidation of equity method investment												0
Income from sales of real estate											0	0	0
Total revenue and other earnings											80,582	102,434	109,181
Other expense											(462)	(1,578)	(1,413)
Allocated interest expense											(29,587)	(40,653)	(40,359)
Allocated general and administrative											(8,254)	(12,997)	(15,223)
Segment profit (loss)											42,279	47,206	52,186
Other Significant Items
Recovery of loan losses											6,482	16,937	(5,828)
Impairment of assets											0	0	0
Depreciation and amortization											0	0	0
Capitalized expenditures											0	0	0
Segment Assets
Real estate, net		0				0					0	0
Real estate available and held for sale		0				0					0	0
Total real estate		0				0					0	0
Net investment in leases		0									0
Land and development, net		0				0					0	0
Loans receivable and other lending investments, net		783,522				988,224					783,522	988,224
Other investments		0				0					0	0
Total portfolio assets		783,522				988,224					783,522	988,224
Operating Segments | Net Lease
Segment Profit (Loss)
Earnings (losses) from equity method investments											29,235	8,479	5,086
Selling profit from sales-type leases											180,416
Income from discontinued operations													4,939
Gain from discontinued operations													123,418
Gain on consolidation of equity method investment												67,877
Income from sales of real estate											224,654	45,038	87,512
Total revenue and other earnings											651,216	277,638	347,243
Other expense											0	0	0
Allocated interest expense											(95,154)	(63,706)	(53,710)
Allocated general and administrative											(25,990)	(20,713)	(19,563)
Segment profit (loss)											505,286	176,186	257,228
Other Significant Items
Recovery of loan losses											0	0	0
Impairment of assets											2,471	10,391	5,486
Depreciation and amortization											51,091	38,588	28,132
Capitalized expenditures											31,445	40,215	4,838
Segment Assets
Real estate, net		1,327,082				1,536,494					1,327,082	1,536,494
Real estate available and held for sale		0				1,055					0	1,055
Total real estate		1,327,082				1,537,549					1,327,082	1,537,549
Net investment in leases		418,915									418,915
Land and development, net		0				0					0	0
Loans receivable and other lending investments, net		44,339				0					44,339	0
Other investments		760,068				165,804					760,068	165,804
Total portfolio assets		2,550,404				1,703,353					2,550,404	1,703,353
Operating Segments | Operating Properties
Segment Profit (Loss)
Earnings (losses) from equity method investments											8,298	(1,003)	(772)
Selling profit from sales-type leases											0
Income from discontinued operations													0
Gain from discontinued operations													0
Gain on consolidation of equity method investment												0
Income from sales of real estate											11,969	80,966	4,537
Total revenue and other earnings											66,074	190,001	116,565
Other expense											0	0	0
Allocated interest expense											(10,249)	(18,618)	(20,171)
Allocated general and administrative											(2,887)	(6,574)	(8,075)
Segment profit (loss)											17,616	84,239	(1,406)
Other Significant Items
Recovery of loan losses											0	0	0
Impairment of assets											3,853	79,991	6,358
Depreciation and amortization											4,977	17,417	17,684
Capitalized expenditures											5,617	19,912	35,754
Segment Assets
Real estate, net		200,137				234,525					200,137	234,525
Real estate available and held for sale		8,650				21,496					8,650	21,496
Total real estate		208,787				256,021					208,787	256,021
Net investment in leases		0									0
Land and development, net		0				0					0	0
Loans receivable and other lending investments, net		0				0					0	0
Other investments		61,686				65,643					61,686	65,643
Total portfolio assets		270,473				321,664					270,473	321,664
Operating Segments | Land and Development
Segment Profit (Loss)
Earnings (losses) from equity method investments											4,322	(3,110)	7,292
Selling profit from sales-type leases											0
Income from discontinued operations													0
Gain from discontinued operations													0
Gain on consolidation of equity method investment												0
Income from sales of real estate											0	0	0
Total revenue and other earnings											132,041	414,477	331,270
Other expense											0	0	0
Allocated interest expense											(20,706)	(21,897)	(28,033)
Allocated general and administrative											(11,957)	(14,313)	(16,483)
Segment profit (loss)											(42,603)	(13,600)	64,688
Other Significant Items
Recovery of loan losses											0	0	0
Impairment of assets											6,427	56,726	20,535
Depreciation and amortization											977	1,353	1,896
Capitalized expenditures											99,031	144,595	125,744
Segment Assets
Real estate, net		0				0					0	0
Real estate available and held for sale		0				0					0	0
Total real estate		0				0					0	0
Net investment in leases		0									0
Land and development, net		580,545				598,218					580,545	598,218
Loans receivable and other lending investments, net		0				0					0	0
Other investments		42,866				65,312					42,866	65,312
Total portfolio assets		623,411				663,530					623,411	663,530
Corporate/Other
Segment Profit (Loss)
Earnings (losses) from equity method investments											(6)	(9,373)	1,409
Selling profit from sales-type leases											0
Income from discontinued operations													0
Gain from discontinued operations													0
Gain on consolidation of equity method investment												0
Income from sales of real estate											0	0	0
Total revenue and other earnings											8,471	2,446	8,364
Other expense											(12,658)	(4,462)	(19,541)
Allocated interest expense											(28,223)	(38,877)	(52,413)
Allocated general and administrative											(19,085)	(19,975)	(20,726)
Segment profit (loss)											(51,495)	(60,868)	(84,316)
Other Significant Items
Recovery of loan losses											0	0	0
Impairment of assets											668	0	0
Depreciation and amortization											1,214	1,341	1,321
Capitalized expenditures											0	0	0
Segment Assets
Real estate, net		0				0					0	0
Real estate available and held for sale		0				0					0	0
Total real estate		0				0					0	0
Net investment in leases		0									0
Land and development, net		0				0					0	0
Loans receivable and other lending investments, net		0				0					0	0
Other investments		43,255				7,516					43,255	7,516
Total portfolio assets		$ 43,255				$ 7,516					43,255	7,516
Operating lease income
Segment Profit (Loss)
Revenue											206,388	208,192	187,684
Operating lease income | Operating Segments | Real Estate Finance
Segment Profit (Loss)
Revenue											0	0	0
Operating lease income | Operating Segments | Net Lease
Segment Profit (Loss)
Revenue											177,679	151,958	123,685
Operating lease income | Operating Segments | Operating Properties
Segment Profit (Loss)
Revenue											28,423	55,677	63,159
Operating lease income | Operating Segments | Land and Development
Segment Profit (Loss)
Revenue											286	557	840
Operating lease income | Corporate/Other
Segment Profit (Loss)
Revenue											0	0	0
Interest income
Segment Profit (Loss)
Revenue											77,654	97,878	106,548
Interest income | Operating Segments | Real Estate Finance
Segment Profit (Loss)
Revenue											75,636	97,878	106,548
Interest income | Operating Segments | Net Lease
Segment Profit (Loss)
Revenue											2,018	0	0
Interest income | Operating Segments | Operating Properties
Segment Profit (Loss)
Revenue											0	0	0
Interest income | Operating Segments | Land and Development
Segment Profit (Loss)
Revenue											0	0	0
Interest income | Corporate/Other
Segment Profit (Loss)
Revenue											0	0	0
Interest income from sales-type leases
Segment Profit (Loss)
Revenue											20,496	0	0
Interest income from sales-type leases | Operating Segments | Real Estate Finance
Segment Profit (Loss)
Revenue											0
Interest income from sales-type leases | Operating Segments | Net Lease
Segment Profit (Loss)
Revenue											20,496
Interest income from sales-type leases | Operating Segments | Operating Properties
Segment Profit (Loss)
Revenue											0
Interest income from sales-type leases | Operating Segments | Land and Development
Segment Profit (Loss)
Revenue											0
Interest income from sales-type leases | Corporate/Other
Segment Profit (Loss)
Revenue											0
Other income
Segment Profit (Loss)
Revenue											55,363	82,342	188,091
Other income | Operating Segments | Real Estate Finance
Segment Profit (Loss)
Revenue											4,946	4,556	2,633
Other income | Operating Segments | Net Lease
Segment Profit (Loss)
Revenue											16,718	4,286	2,603
Other income | Operating Segments | Operating Properties
Segment Profit (Loss)
Revenue											17,384	54,361	49,641
Other income | Operating Segments | Land and Development
Segment Profit (Loss)
Revenue											7,838	7,320	126,259
Other income | Corporate/Other
Segment Profit (Loss)
Revenue											8,477	11,819	6,955
Land development
Segment Profit (Loss)
Revenue											119,595	409,710	196,879
Cost of sales expense											(109,663)	(350,181)	(180,916)
Land development | Operating Segments | Real Estate Finance
Segment Profit (Loss)
Revenue											0	0	0
Cost of sales expense											0	0	0
Land development | Operating Segments | Net Lease
Segment Profit (Loss)
Revenue											0	0	0
Cost of sales expense											0	0	0
Land development | Operating Segments | Operating Properties
Segment Profit (Loss)
Revenue											0	0	0
Cost of sales expense											0	0	0
Land development | Operating Segments | Land and Development
Segment Profit (Loss)
Revenue											119,595	409,710	196,879
Cost of sales expense											(109,663)	(350,181)	(180,916)
Land development | Corporate/Other
Segment Profit (Loss)
Revenue											0	0	0
Cost of sales expense											0	0	0
Real estate
Segment Profit (Loss)
Cost of sales expense											(92,426)	(139,289)	(147,617)
Real estate | Operating Segments | Real Estate Finance
Segment Profit (Loss)
Cost of sales expense											0	0	0
Real estate | Operating Segments | Net Lease
Segment Profit (Loss)
Cost of sales expense											(24,786)	(17,033)	(16,742)
Real estate | Operating Segments | Operating Properties
Segment Profit (Loss)
Cost of sales expense											(35,322)	(80,570)	(89,725)
Real estate | Operating Segments | Land and Development
Segment Profit (Loss)
Cost of sales expense											(32,318)	(41,686)	(41,150)
Real estate | Corporate/Other
Segment Profit (Loss)
Cost of sales expense											$ 0	$ 0	$ 0

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