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Segment Reporting (Schedule of Segments) (Details) $ in Thousands		3 Months Ended			9 Months Ended
		Sep. 30, 2021 USD ($)		Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) segment		Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)		May 31, 2019 USD ($)
Segment Profit (Loss)
Number of reportable segments | segment					4
Revenues		$ 195,485		$ 115,054	$ 414,335		$ 384,930
Earnings (losses) from equity method investments		89,209		6,805	114,675		26,003
Income from sales of real estate		25,611		6,055	28,433		6,118
Total revenue and other earnings		310,305		127,914	557,443		417,051
Other expense		(2,011)		(73)	(2,475)		(351)
Allocated interest expense		(39,471)		(42,407)	(118,451)		(127,748)
Allocated general and administrative		(14,120)		(14,207)	(45,654)		(46,463)
Segment profit (loss)		148,599		32,934	189,449		74,077
Other significant items:
(Recovery of) provision for loan losses		(1,556)		(1,976)	(7,613)		4,093
(Recovery of) provision for losses on net investment in leases		131		175	(1,735)		2,001
Impairment of assets		1,179		0	2,965		6,491
Depreciation and amortization		14,856		14,621	44,971		43,407
Capitalized expenditures		8,506		7,150	19,637		35,556
Segment assets
Real estate, net	[1]	1,356,924			1,356,924			$ 1,484,281
Real estate available and held for sale	[1]	1,983			1,983			5,212
Total real estate	[1]	1,358,907			1,358,907			1,489,493
Net investment in leases		477,360	[1]		477,360	[1]		429,101	[1]	$ 424,100
Land and development, net	[1]	302,845			302,845			430,663
Loans receivable and other lending investments, net		405,509			405,509			732,330
Loan receivable held for sale		42,683			42,683
Other investments	[1]	1,419,766			1,419,766			1,176,560
Total portfolio assets		4,007,070			4,007,070			4,258,147
Cash and other assets		795,095			795,095			603,661
Total assets	[1]	4,802,165			4,802,165			4,861,808
Stock-based compensation expense		3,001		5,661	23,300		26,675
Operating lease income
Segment Profit (Loss)
Revenues		44,392		46,370	137,381		140,529
Interest income
Segment Profit (Loss)
Revenues		7,951		14,270	27,574		46,925
Interest income from sales-type leases
Segment Profit (Loss)
Revenues		9,578		8,360	26,895		25,010
Other income
Segment Profit (Loss)
Revenues		40,195		25,552	64,549		56,212
Land development revenue
Segment Profit (Loss)
Revenues		93,369		20,502	157,936		116,254
Cost of sales expense		(87,380)		(21,358)	(147,507)		(114,704)
Real estate expense
Segment Profit (Loss)
Cost of sales expense		(18,724)		(16,935)	(53,907)		(53,708)
Operating Segments | Net Lease
Segment Profit (Loss)
Earnings (losses) from equity method investments		74,889		10,141	98,604		38,472
Income from sales of real estate				6,055	2,114		6,056
Total revenue and other earnings		131,523		71,165	269,448		209,709
Other expense		(1,327)			(1,327)
Allocated interest expense		(26,467)		(26,049)	(76,888)		(74,915)
Allocated general and administrative		(5,487)		(5,161)	(17,544)		(17,327)
Segment profit (loss)		92,796		32,819	152,624		97,970
Other significant items:
(Recovery of) provision for loan losses		54		19	(202)		212
(Recovery of) provision for losses on net investment in leases		131		175	(1,735)		2,001
Impairment of assets		757			2,286		2,036
Depreciation and amortization		13,114		12,781	39,255		37,924
Capitalized expenditures		969		1,896	2,300		8,913
Segment assets
Real estate, net		1,263,881			1,263,881			1,291,903
Total real estate		1,263,881			1,263,881			1,291,903
Net investment in leases		477,360			477,360			429,101
Loans receivable and other lending investments, net		47,555			47,555			45,398
Loan receivable held for sale		42,683			42,683
Other investments		1,213,804			1,213,804			1,016,710
Total portfolio assets		3,045,283			3,045,283			2,783,112
Operating Segments | Net Lease | Operating lease income
Segment Profit (Loss)
Revenues		40,659		41,144	123,926		124,109
Operating Segments | Net Lease | Interest income
Segment Profit (Loss)
Revenues		1,630		911	3,696		2,594
Operating Segments | Net Lease | Interest income from sales-type leases
Segment Profit (Loss)
Revenues		9,578		8,360	26,895		25,010
Operating Segments | Net Lease | Other income
Segment Profit (Loss)
Revenues		4,767		4,554	14,213		13,468
Operating Segments | Net Lease | Real estate expense
Segment Profit (Loss)
Cost of sales expense		(5,446)		(7,136)	(21,065)		(19,497)
Operating Segments | Real Estate Finance
Segment Profit (Loss)
Earnings (losses) from equity method investments		872			2,092
Total revenue and other earnings		8,288		13,463	27,215		48,580
Other expense		(270)		(37)	(422)		(80)
Allocated interest expense		(3,331)		(5,831)	(11,737)		(17,989)
Allocated general and administrative		(958)		(1,451)	(3,659)		(5,123)
Segment profit (loss)		3,729		6,144	11,397		25,388
Other significant items:
(Recovery of) provision for loan losses		(1,610)		(1,995)	(7,411)		3,881
Segment assets
Loans receivable and other lending investments, net		357,954			357,954			686,932
Other investments		47,936			47,936
Total portfolio assets		405,890			405,890			686,932
Operating Segments | Real Estate Finance | Interest income
Segment Profit (Loss)
Revenues		6,321		13,359	23,878		44,331
Operating Segments | Real Estate Finance | Other income
Segment Profit (Loss)
Revenues		1,095		104	1,245		4,249
Operating Segments | Operating Properties
Segment Profit (Loss)
Earnings (losses) from equity method investments		1,129		(4,134)	(5,553)		(11,741)
Income from sales of real estate		25,611			26,319		62
Total revenue and other earnings		47,246		3,959	57,101		11,079
Allocated interest expense		(1,641)		(2,289)	(5,714)		(6,731)
Allocated general and administrative		(473)		(582)	(1,797)		(1,966)
Segment profit (loss)		35,948		(3,340)	30,352		(14,218)
Other significant items:
Impairment of assets		422			679		2,983
Depreciation and amortization		1,385		1,287	4,593		3,843
Capitalized expenditures		121		84	610		1,421
Segment assets
Real estate, net		93,043			93,043			192,378
Real estate available and held for sale		1,983			1,983			5,212
Total real estate		95,026			95,026			197,590
Other investments		43,659			43,659			58,739
Total portfolio assets		138,685			138,685			256,329
Operating Segments | Operating Properties | Operating lease income
Segment Profit (Loss)
Revenues		3,637		5,137	13,176		16,153
Operating Segments | Operating Properties | Other income
Segment Profit (Loss)
Revenues		16,869		2,956	23,159		6,605
Operating Segments | Operating Properties | Real estate expense
Segment Profit (Loss)
Cost of sales expense		(9,184)		(4,428)	(19,238)		(16,600)
Operating Segments | Land and Development
Segment Profit (Loss)
Earnings (losses) from equity method investments		10,836		592	15,456		1,225
Total revenue and other earnings		107,490		25,014	179,565		123,304
Other expense		(64)			(64)
Allocated interest expense		(3,679)		(4,606)	(11,481)		(13,598)
Allocated general and administrative		(2,173)		(2,320)	(6,968)		(7,524)
Segment profit (loss)		10,100		(8,641)	(59)		(30,133)
Other significant items:
Impairment of assets							1,472
Depreciation and amortization		228		243	674		729
Capitalized expenditures		7,416		5,170	16,727		25,222
Segment assets
Land and development, net		302,845			302,845			430,663
Other investments		537			537			31,200
Total portfolio assets		303,382			303,382			461,863
Operating Segments | Land and Development | Operating lease income
Segment Profit (Loss)
Revenues		96		89	279		267
Operating Segments | Land and Development | Other income
Segment Profit (Loss)
Revenues		3,189		3,831	5,894		5,558
Operating Segments | Land and Development | Land development revenue
Segment Profit (Loss)
Revenues		93,369		20,502	157,936		116,254
Cost of sales expense		(87,380)		(21,358)	(147,507)		(114,704)
Operating Segments | Land and Development | Real estate expense
Segment Profit (Loss)
Cost of sales expense		(4,094)		(5,371)	(13,604)		(17,611)
Corporate/Other
Segment Profit (Loss)
Earnings (losses) from equity method investments		1,483		206	4,076		(1,953)
Total revenue and other earnings		15,758		14,313	24,114		24,379
Other expense		(350)		(36)	(662)		(271)
Allocated interest expense		(4,353)		(3,632)	(12,631)		(14,515)
Allocated general and administrative		(5,029)		(4,693)	(15,686)		(14,523)
Segment profit (loss)		6,026		5,952	(4,865)		(4,930)
Other significant items:
Depreciation and amortization		129		310	449		911
Segment assets
Other investments		113,830			113,830			69,911
Total portfolio assets		113,830			113,830			$ 69,911
Corporate/Other | Other income
Segment Profit (Loss)
Revenues		$ 14,275		$ 14,107	$ 20,038		$ 26,332
[1] Refer to Note 2 for details on the Company’s consolidated variable interest entities (“VIEs”).

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