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Segment Reporting - Schedule of Segments (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) segment	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	May 31, 2019 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment			4
Segment Reporting
Revenues	$ 115,054	$ 145,338	$ 384,930	$ 350,608
Earnings from equity method investments	6,805	7,617	26,003	16,566
Selling profit from sales-type leases	0	0	0	180,416
Income from sales of real estate	6,055	3,476	6,118	233,406
Total revenue and other earnings	127,914	156,431	417,051	780,996
Other expense	(73)	(407)	(351)	(12,798)
Allocated interest expense	(42,407)	(46,522)	(127,748)	(136,851)
Allocated general and administrative	(14,207)	(17,370)	(46,463)	(51,818)
Segment profit (loss)	32,934	20,844	74,077	436,579
Other significant items:
(Recovery of) provision for loan losses	(1,976)	(3,805)	4,093	(3,792)
Provision for losses on net investment in leases	175	0	2,001	0
Impairment of assets	0	0	6,491	4,953
Depreciation and amortization	14,621	14,199	43,407	43,586
Capitalized expenditures	7,150	31,198	35,556	103,614
Segment assets
Real estate, net	1,487,095		1,487,095		$ 1,527,219
Real estate available and held for sale	5,519		5,519		8,650
Total real estate	1,492,614		1,492,614		1,535,869
Net investment in leases	420,417		420,417		418,915	$ 424,100
Land and development, net	488,916		488,916		580,545
Loans receivable and other lending investments, net	765,073		765,073		827,861
Other investments	1,123,093		1,123,093		907,875
Total portfolio assets	4,290,113		4,290,113		4,271,065
Cash and other assets	598,010		598,010		814,044
Total assets	4,888,123		4,888,123		5,085,109
Stock-based compensation expense	5,661	6,740	26,675	20,694
Operating lease income
Segment Reporting
Revenues	46,370	44,110	140,529	158,210
Interest income
Segment Reporting
Revenues	14,270	19,701	46,925	60,417
Interest income from sales-type leases
Segment Reporting
Revenues	8,360	8,339	25,010	12,157
Other income
Segment Reporting
Revenues	25,552	18,270	56,212	43,133
Real estate expense
Segment Reporting
Cost of sales expense	(16,935)	(23,187)	(53,708)	(71,165)
Land development revenue
Segment Reporting
Revenues	20,502	54,918	116,254	76,691
Cost of sales expense	(21,358)	(48,101)	(114,704)	(71,785)
Operating Segments | Net Lease
Segment Reporting
Earnings from equity method investments	10,141	2,848	38,472	13,660
Selling profit from sales-type leases				180,416
Income from sales of real estate	6,055	3,458	6,056	223,200
Total revenue and other earnings	71,165	59,787	209,709	579,485
Other expense	0	0	0	0
Allocated interest expense	(26,049)	(25,176)	(74,915)	(70,548)
Allocated general and administrative	(5,161)	(6,887)	(17,327)	(19,299)
Segment profit (loss)	32,819	21,264	97,970	471,303
Other significant items:
(Recovery of) provision for loan losses	19	0	212	0
Provision for losses on net investment in leases	175		2,001
Impairment of assets			2,036	0
Depreciation and amortization	12,781	12,409	37,924	38,242
Capitalized expenditures	1,896	7,846	8,913	12,707
Segment assets
Real estate, net	1,288,931		1,288,931		1,327,082
Real estate available and held for sale	0		0		0
Total real estate	1,288,931		1,288,931		1,327,082
Net investment in leases	420,417		420,417		418,915
Land and development, net	0		0		0
Loans receivable and other lending investments, net	44,528		44,528		44,339
Other investments	959,201		959,201		760,068
Total portfolio assets	2,713,077		2,713,077		2,550,404
Operating Segments | Net Lease | Operating lease income
Segment Reporting
Revenues	41,144	38,006	124,109	136,150
Operating Segments | Net Lease | Interest income
Segment Reporting
Revenues	911	789	2,594	1,197
Operating Segments | Net Lease | Interest income from sales-type leases
Segment Reporting
Revenues	8,360	8,339	25,010	12,157
Operating Segments | Net Lease | Other income
Segment Reporting
Revenues	4,554	6,347	13,468	12,705
Operating Segments | Net Lease | Real estate expense
Segment Reporting
Cost of sales expense	(7,136)	(6,460)	(19,497)	(18,335)
Operating Segments | Net Lease | Land development revenue
Segment Reporting
Revenues	0	0	0	0
Cost of sales expense	0	0	0	0
Operating Segments | Real Estate Finance
Segment Reporting
Earnings from equity method investments	0	0	0	0
Selling profit from sales-type leases				0
Income from sales of real estate	0	0	0	0
Total revenue and other earnings	13,463	19,027	48,580	62,056
Other expense	(37)	(49)	(80)	(359)
Allocated interest expense	(5,831)	(6,902)	(17,989)	(23,251)
Allocated general and administrative	(1,451)	(2,035)	(5,123)	(6,523)
Segment profit (loss)	6,144	10,041	25,388	31,923
Other significant items:
(Recovery of) provision for loan losses	(1,995)	(3,805)	3,881	(3,792)
Provision for losses on net investment in leases	0		0
Impairment of assets			0	0
Depreciation and amortization	0	0	0	0
Capitalized expenditures	0	0	0	0
Segment assets
Real estate, net	0		0		0
Real estate available and held for sale	0		0		0
Total real estate	0		0		0
Net investment in leases	0		0		0
Land and development, net	0		0		0
Loans receivable and other lending investments, net	720,545		720,545		783,522
Other investments	0		0		0
Total portfolio assets	720,545		720,545		783,522
Operating Segments | Real Estate Finance | Operating lease income
Segment Reporting
Revenues	0	0	0	0
Operating Segments | Real Estate Finance | Interest income
Segment Reporting
Revenues	13,359	18,912	44,331	59,220
Operating Segments | Real Estate Finance | Interest income from sales-type leases
Segment Reporting
Revenues	0	0	0	0
Operating Segments | Real Estate Finance | Other income
Segment Reporting
Revenues	104	115	4,249	2,836
Operating Segments | Real Estate Finance | Real estate expense
Segment Reporting
Cost of sales expense	0	0	0	0
Operating Segments | Real Estate Finance | Land development revenue
Segment Reporting
Revenues	0	0	0	0
Cost of sales expense	0	0	0	0
Operating Segments | Operating Properties
Segment Reporting
Earnings from equity method investments	(4,134)	4,875	(11,741)	(166)
Selling profit from sales-type leases				0
Income from sales of real estate	0	18	62	10,206
Total revenue and other earnings	3,959	18,538	11,079	45,844
Other expense	0	0	0	0
Allocated interest expense	(2,289)	(2,393)	(6,731)	(7,859)
Allocated general and administrative	(582)	(727)	(1,966)	(2,214)
Segment profit (loss)	(3,340)	6,104	(14,218)	7,125
Other significant items:
(Recovery of) provision for loan losses	0	0	0	0
Provision for losses on net investment in leases	0		0
Impairment of assets			2,983	3,853
Depreciation and amortization	1,287	1,244	3,843	3,701
Capitalized expenditures	84	2,816	1,421	4,878
Segment assets
Real estate, net	198,164		198,164		200,137
Real estate available and held for sale	5,519		5,519		8,650
Total real estate	203,683		203,683		208,787
Net investment in leases	0		0		0
Land and development, net	0		0		0
Loans receivable and other lending investments, net	0		0		0
Other investments	61,315		61,315		61,686
Total portfolio assets	264,998		264,998		270,473
Operating Segments | Operating Properties | Operating lease income
Segment Reporting
Revenues	5,137	6,034	16,153	21,844
Operating Segments | Operating Properties | Interest income
Segment Reporting
Revenues	0	0	0	0
Operating Segments | Operating Properties | Interest income from sales-type leases
Segment Reporting
Revenues	0	0	0	0
Operating Segments | Operating Properties | Other income
Segment Reporting
Revenues	2,956	7,611	6,605	13,960
Operating Segments | Operating Properties | Real estate expense
Segment Reporting
Cost of sales expense	(4,428)	(9,314)	(16,600)	(28,646)
Operating Segments | Operating Properties | Land development revenue
Segment Reporting
Revenues	0	0	0	0
Cost of sales expense	0	0	0	0
Operating Segments | Land and Development
Segment Reporting
Earnings from equity method investments	592	(301)	1,225	2,910
Selling profit from sales-type leases				0
Income from sales of real estate	0	0	0	0
Total revenue and other earnings	25,014	56,811	123,304	86,694
Other expense	0	0	0	0
Allocated interest expense	(4,606)	(5,268)	(13,598)	(15,888)
Allocated general and administrative	(2,320)	(3,019)	(7,524)	(9,199)
Segment profit (loss)	(8,641)	(6,990)	(30,133)	(34,362)
Other significant items:
(Recovery of) provision for loan losses	0	0	0	0
Provision for losses on net investment in leases	0		0
Impairment of assets			1,472	1,100
Depreciation and amortization	243	243	729	733
Capitalized expenditures	5,170	20,536	25,222	86,029
Segment assets
Real estate, net	0		0		0
Real estate available and held for sale	0		0		0
Total real estate	0		0		0
Net investment in leases	0		0		0
Land and development, net	488,916		488,916		580,545
Loans receivable and other lending investments, net	0		0		0
Other investments	30,357		30,357		42,866
Total portfolio assets	519,273		519,273		623,411
Operating Segments | Land and Development | Operating lease income
Segment Reporting
Revenues	89	70	267	216
Operating Segments | Land and Development | Interest income
Segment Reporting
Revenues	0	0	0	0
Operating Segments | Land and Development | Interest income from sales-type leases
Segment Reporting
Revenues	0	0	0	0
Operating Segments | Land and Development | Other income
Segment Reporting
Revenues	3,831	2,124	5,558	6,877
Operating Segments | Land and Development | Real estate expense
Segment Reporting
Cost of sales expense	(5,371)	(7,413)	(17,611)	(24,184)
Operating Segments | Land and Development | Land development revenue
Segment Reporting
Revenues	20,502	54,918	116,254	76,691
Cost of sales expense	(21,358)	(48,101)	(114,704)	(71,785)
Corporate/Other
Segment Reporting
Earnings from equity method investments	206	195	(1,953)	162
Selling profit from sales-type leases				0
Income from sales of real estate	0	0	0	0
Total revenue and other earnings	14,313	2,268	24,379	6,917
Other expense	(36)	(358)	(271)	(12,439)
Allocated interest expense	(3,632)	(6,783)	(14,515)	(19,305)
Allocated general and administrative	(4,693)	(4,702)	(14,523)	(14,583)
Segment profit (loss)	5,952	(9,575)	(4,930)	(39,410)
Other significant items:
(Recovery of) provision for loan losses	0	0	0	0
Provision for losses on net investment in leases	0		0
Impairment of assets			0	0
Depreciation and amortization	310	303	911	910
Capitalized expenditures	0	0	0	0
Segment assets
Real estate, net	0		0		0
Real estate available and held for sale	0		0		0
Total real estate	0		0		0
Net investment in leases	0		0		0
Land and development, net	0		0		0
Loans receivable and other lending investments, net	0		0		0
Other investments	72,220		72,220		43,255
Total portfolio assets	72,220		72,220		$ 43,255
Corporate/Other | Operating lease income
Segment Reporting
Revenues	0	0	0	0
Corporate/Other | Interest income
Segment Reporting
Revenues	0	0	0	0
Corporate/Other | Interest income from sales-type leases
Segment Reporting
Revenues	0	0	0	0
Corporate/Other | Other income
Segment Reporting
Revenues	14,107	2,073	26,332	6,755
Corporate/Other | Real estate expense
Segment Reporting
Cost of sales expense	0	0	0	0
Corporate/Other | Land development revenue
Segment Reporting
Revenues	0	0	0	0
Cost of sales expense	$ 0	$ 0	$ 0	$ 0

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