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Segment Reporting (Schedule of Segments) (Details) $ in Thousands		3 Months Ended
		Mar. 31, 2021 USD ($) segment		Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)		May 31, 2019 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment		4
Segment Reporting
Revenues		$ 113,260		$ 173,461
Earnings (losses) from equity method investments		12,769		16,612
Income from sales of real estate		612		0
Total revenue and other earnings		126,641		190,073
Other expense		(253)		(74)
Allocated interest expense		(39,563)		(43,392)
Allocated general and administrative		(15,931)		(18,001)
Segment profit (loss)		24,677		29,049
Other significant items:
(Recovery of) provision for loan losses		(3,794)		4,003
Recovery of (provision for) losses on net investment in leases		(1,601)		1,292
Impairment of assets		1,785		1,708
Depreciation and amortization		15,455		14,486
Capitalized expenditures		6,064		14,790
Segment assets
Real estate, net	[1]	1,474,393			$ 1,484,281
Real estate available and held for sale	[1]	2,600			5,212
Total real estate	[1]	1,476,993			1,489,493
Net investment in leases		431,126	[1]		429,101	[1]	$ 424,100
Land and development, net	[1]	406,781			430,663
Loans receivable and other lending investments, net	[1]	533,716			732,330
Loan receivable held for sale	[1]	16,086			0
Other investments	[1]	1,237,295			1,176,560
Total portfolio assets		4,101,997			4,258,147
Cash and other assets		691,594			603,661
Total assets	[1]	4,793,591			4,861,808
Stock-based compensation expense		5,508		16,270
Operating lease income
Segment Reporting
Revenues		47,444		47,346
Interest income
Segment Reporting
Revenues		10,650		17,216
Interest income from sales-type leases
Segment Reporting
Revenues		8,627		8,355
Other income
Segment Reporting
Revenues		14,290		20,368
Land development revenue
Segment Reporting
Revenues		32,249		80,176
Cost of sales expense		(29,323)		(77,059)
Real estate expense
Segment Reporting
Cost of sales expense		(16,894)		(22,498)
Operating Segments | Net Lease
Segment Reporting
Earnings (losses) from equity method investments		12,413		19,531
Income from sales of real estate		0
Total revenue and other earnings		69,182		74,466
Other expense		0		0
Allocated interest expense		(25,079)		(24,478)
Allocated general and administrative		(5,937)		(6,989)
Segment profit (loss)		29,533		36,770
Other significant items:
(Recovery of) provision for loan losses		(152)		137
Recovery of (provision for) losses on net investment in leases		(1,601)		1,292
Impairment of assets		1,528		1,708
Depreciation and amortization		13,054		12,656
Capitalized expenditures		1,268		1,846
Segment assets
Real estate, net		1,283,082			1,291,903
Real estate available and held for sale		0			0
Total real estate		1,283,082			1,291,903
Net investment in leases		431,126			429,101
Land and development, net		0			0
Loans receivable and other lending investments, net		46,411			45,398
Loan receivable held for sale		16,086
Other investments		1,040,238			1,016,710
Total portfolio assets		2,816,943			2,783,112
Operating Segments | Net Lease | Operating lease income
Segment Reporting
Revenues		42,513		41,464
Operating Segments | Net Lease | Interest income
Segment Reporting
Revenues		878		823
Operating Segments | Net Lease | Interest income from sales-type leases
Segment Reporting
Revenues		8,627		8,355
Operating Segments | Net Lease | Other income
Segment Reporting
Revenues		4,751		4,293
Operating Segments | Net Lease | Land development revenue
Segment Reporting
Revenues		0		0
Cost of sales expense		0		0
Operating Segments | Net Lease | Real estate expense
Segment Reporting
Cost of sales expense		(8,633)		(6,229)
Operating Segments | Real Estate Finance
Segment Reporting
Earnings (losses) from equity method investments		466		0
Income from sales of real estate		0
Total revenue and other earnings		10,337		16,699
Other expense		(64)		(19)
Allocated interest expense		(4,578)		(6,199)
Allocated general and administrative		(1,459)		(2,097)
Segment profit (loss)		4,236		8,384
Other significant items:
(Recovery of) provision for loan losses		(3,642)		3,866
Recovery of (provision for) losses on net investment in leases		0		0
Impairment of assets		0		0
Depreciation and amortization		0		0
Capitalized expenditures		0		0
Segment assets
Real estate, net		0			0
Real estate available and held for sale		0			0
Total real estate		0			0
Net investment in leases		0			0
Land and development, net		0			0
Loans receivable and other lending investments, net		487,305			686,932
Loan receivable held for sale		0
Other investments		44,672			0
Total portfolio assets		531,977			686,932
Operating Segments | Real Estate Finance | Operating lease income
Segment Reporting
Revenues		0		0
Operating Segments | Real Estate Finance | Interest income
Segment Reporting
Revenues		9,772		16,393
Operating Segments | Real Estate Finance | Interest income from sales-type leases
Segment Reporting
Revenues		0		0
Operating Segments | Real Estate Finance | Other income
Segment Reporting
Revenues		99		306
Operating Segments | Real Estate Finance | Land development revenue
Segment Reporting
Revenues		0		0
Cost of sales expense		0		0
Operating Segments | Real Estate Finance | Real estate expense
Segment Reporting
Cost of sales expense		0		0
Operating Segments | Operating Properties
Segment Reporting
Earnings (losses) from equity method investments		(3,747)		(2,667)
Income from sales of real estate		612
Total revenue and other earnings		4,039		6,264
Other expense		0		0
Allocated interest expense		(2,043)		(2,259)
Allocated general and administrative		(660)		(789)
Segment profit (loss)		(2,463)		(4,447)
Other significant items:
(Recovery of) provision for loan losses		0		0
Recovery of (provision for) losses on net investment in leases		0		0
Impairment of assets		257		0
Depreciation and amortization		1,988		1,284
Capitalized expenditures		57		917
Segment assets
Real estate, net		191,311			192,378
Real estate available and held for sale		2,600			5,212
Total real estate		193,911			197,590
Net investment in leases		0			0
Land and development, net		0			0
Loans receivable and other lending investments, net		0			0
Loan receivable held for sale		0
Other investments		56,977			58,739
Total portfolio assets		250,888			256,329
Operating Segments | Operating Properties | Operating lease income
Segment Reporting
Revenues		4,837		5,774
Operating Segments | Operating Properties | Interest income
Segment Reporting
Revenues		0		0
Operating Segments | Operating Properties | Interest income from sales-type leases
Segment Reporting
Revenues		0		0
Operating Segments | Operating Properties | Other income
Segment Reporting
Revenues		2,337		3,157
Operating Segments | Operating Properties | Land development revenue
Segment Reporting
Revenues		0		0
Cost of sales expense		0		0
Operating Segments | Operating Properties | Real estate expense
Segment Reporting
Cost of sales expense		(3,799)		(7,663)
Operating Segments | Land and Development
Segment Reporting
Earnings (losses) from equity method investments		3,146		584
Income from sales of real estate		0
Total revenue and other earnings		36,878		81,492
Other expense		0		0
Allocated interest expense		(3,938)		(4,570)
Allocated general and administrative		(2,428)		(2,819)
Segment profit (loss)		(3,273)		(11,562)
Other significant items:
(Recovery of) provision for loan losses		0		0
Recovery of (provision for) losses on net investment in leases		0		0
Impairment of assets		0		0
Depreciation and amortization		218		243
Capitalized expenditures		4,739		12,027
Segment assets
Real estate, net		0			0
Real estate available and held for sale		0			0
Total real estate		0			0
Net investment in leases		0			0
Land and development, net		406,781			430,663
Loans receivable and other lending investments, net		0			0
Loan receivable held for sale		0
Other investments		12,107			31,200
Total portfolio assets		418,888			461,863
Operating Segments | Land and Development | Operating lease income
Segment Reporting
Revenues		94		108
Operating Segments | Land and Development | Interest income
Segment Reporting
Revenues		0		0
Operating Segments | Land and Development | Interest income from sales-type leases
Segment Reporting
Revenues		0		0
Operating Segments | Land and Development | Other income
Segment Reporting
Revenues		1,389		624
Operating Segments | Land and Development | Land development revenue
Segment Reporting
Revenues		32,249		80,176
Cost of sales expense		(29,323)		(77,059)
Operating Segments | Land and Development | Real estate expense
Segment Reporting
Cost of sales expense		(4,462)		(8,606)
Corporate/Other
Segment Reporting
Earnings (losses) from equity method investments		491		(836)
Income from sales of real estate		0
Total revenue and other earnings		6,205		11,152
Other expense		(189)		(55)
Allocated interest expense		(3,925)		(5,886)
Allocated general and administrative		(5,447)		(5,307)
Segment profit (loss)		(3,356)		(96)
Other significant items:
(Recovery of) provision for loan losses		0		0
Recovery of (provision for) losses on net investment in leases		0		0
Impairment of assets		0		0
Depreciation and amortization		195		303
Capitalized expenditures		0		0
Segment assets
Real estate, net		0			0
Real estate available and held for sale		0			0
Total real estate		0			0
Net investment in leases		0			0
Land and development, net		0			0
Loans receivable and other lending investments, net		0			0
Loan receivable held for sale		0
Other investments		83,301			69,911
Total portfolio assets		83,301			$ 69,911
Corporate/Other | Operating lease income
Segment Reporting
Revenues		0		0
Corporate/Other | Interest income
Segment Reporting
Revenues		0		0
Corporate/Other | Interest income from sales-type leases
Segment Reporting
Revenues		0		0
Corporate/Other | Other income
Segment Reporting
Revenues		5,714		11,988
Corporate/Other | Land development revenue
Segment Reporting
Revenues		0		0
Cost of sales expense		0		0
Corporate/Other | Real estate expense
Segment Reporting
Cost of sales expense		$ 0		$ 0
[1] (1)Refer to Note 2 for details on the Company's consolidated variable interest entities ("VIEs").

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