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Segment Reporting - Schedule of Segments (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) segments	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	May 31, 2019 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segments			4
Segment Reporting
Revenues	$ 96,415	$ 98,468	$ 269,875	$ 205,270
Earnings from equity method investments	2,586	3,640	19,198	8,949
Selling profit from sales-type leases	0	180,416	0	180,416
Income from sales of real estate	62	220,523	62	229,930
Total revenue and other earnings	99,063	503,047	289,135	624,565
Other expense	(203)	(11,883)	(277)	(12,391)
Allocated interest expense	(41,950)	(43,752)	(85,341)	(90,329)
Allocated general and administrative	(14,254)	(17,598)	(32,256)	(34,448)
Segment profit (loss)	12,093	398,540	41,141	415,735
Other significant items:
Provision for loan losses	2,067	110	6,070	13
Provision for losses on net investment in leases	534	0	1,826	0
Impairment of assets	4,783	1,102	6,491	4,953
Depreciation and amortization	14,300	13,718	28,786	29,386
Capitalized expenditures	13,618	33,165	28,407	72,417
Segment assets
Real estate, net	1,496,068		1,496,068		$ 1,527,219
Real estate available and held for sale	32,163		32,163		8,650
Total real estate	1,528,231		1,528,231		1,535,869
Net investment in leases	413,736		413,736		418,915	$ 424,100
Land and development, net	504,577		504,577		580,545
Loans receivable and other lending investments, net	801,707		801,707		827,861
Other investments	1,049,930		1,049,930		907,875
Total portfolio assets	4,298,181		4,298,181		4,271,065
Cash and other assets	584,419		584,419		814,044
Total assets	4,882,600		4,882,600		5,085,109
Stock-based compensation expense	4,744	9,705	21,014	13,954
Operating lease income
Segment Reporting
Revenues	46,812	55,185	94,158	114,100
Interest income
Segment Reporting
Revenues	15,439	20,341	32,655	40,716
Interest income from sales-type leases
Segment Reporting
Revenues	8,295	3,817	16,650	3,817
Other income
Segment Reporting
Revenues	10,292	10,050	30,660	24,863
Land development revenue
Segment Reporting
Revenues	15,577	9,075	95,752	21,774
Cost of sales expense	(16,287)	(9,236)	(93,346)	(23,684)
Real estate expense
Segment Reporting
Cost of sales expense	(14,276)	(22,038)	(36,774)	(47,978)
Operating Segments | Net Lease
Segment Reporting
Earnings from equity method investments	8,800	3,582	28,332	10,812
Selling profit from sales-type leases		180,416		180,416
Income from sales of real estate	0	219,742	0	219,742
Total revenue and other earnings	64,076	459,562	138,543	519,696
Other expense	0	0	0	0
Allocated interest expense	(24,388)	(23,606)	(48,866)	(45,372)
Allocated general and administrative	(5,177)	(6,734)	(12,166)	(12,412)
Segment profit (loss)	28,377	423,453	65,150	450,038
Other significant items:
Provision for loan losses	57	0	0	0
Provision for losses on net investment in leases	534		1,826
Impairment of assets	328	0	2,036	0
Depreciation and amortization	12,487	12,272	25,143	25,832
Capitalized expenditures	5,171	2,105	7,017	4,861
Segment assets
Real estate, net	1,296,853		1,296,853		1,327,082
Real estate available and held for sale	26,644		26,644		0
Total real estate	1,323,497		1,323,497		1,327,082
Net investment in leases	413,736		413,736		418,915
Land and development, net	0		0		0
Loans receivable and other lending investments, net	43,874		43,874		44,339
Other investments	898,390		898,390		760,068
Total portfolio assets	2,679,497		2,679,497		2,550,404
Operating Segments | Net Lease | Operating lease income
Segment Reporting
Revenues	41,500	48,660	82,965	98,143
Operating Segments | Net Lease | Interest income
Segment Reporting
Revenues	860	408	1,683	408
Operating Segments | Net Lease | Interest income from sales-type leases
Segment Reporting
Revenues	8,295	3,817	16,650	3,817
Operating Segments | Net Lease | Other income
Segment Reporting
Revenues	4,621	2,937	8,913	6,358
Operating Segments | Net Lease | Land development revenue
Segment Reporting
Revenues	0	0	0	0
Cost of sales expense	0	0	0	0
Operating Segments | Net Lease | Real estate expense
Segment Reporting
Cost of sales expense	(6,134)	(5,769)	(12,361)	(11,874)
Operating Segments | Real Estate Finance
Segment Reporting
Earnings from equity method investments	0	0	0	0
Selling profit from sales-type leases		0		0
Income from sales of real estate	0	0	0	0
Total revenue and other earnings	18,418	20,465	35,117	43,029
Other expense	(21)	(47)	(41)	(311)
Allocated interest expense	(5,959)	(7,936)	(12,158)	(16,349)
Allocated general and administrative	(1,575)	(2,279)	(3,672)	(4,488)
Segment profit (loss)	10,863	10,203	19,246	21,881
Other significant items:
Provision for loan losses	2,010	110	6,070	13
Provision for losses on net investment in leases	0		0
Impairment of assets	0	0	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	757,833		757,833		783,522
Other investments	0		0		0
Total portfolio assets	757,833		757,833		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	14,579	19,933	30,972	40,308
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	3,839	532	4,145	2,721
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 | Real Estate Finance | Real estate expense
Segment Reporting
Cost of sales expense	0	0	0	0
Operating Segments | Operating Properties
Segment Reporting
Earnings from equity method investments	(4,941)	(2,630)	(7,608)	(5,040)
Selling profit from sales-type leases		0		0
Income from sales of real estate	62	781	62	10,188
Total revenue and other earnings	855	8,580	7,119	27,307
Other expense	0	0	0	0
Allocated interest expense	(2,183)	(2,548)	(4,442)	(5,466)
Allocated general and administrative	(595)	(726)	(1,384)	(1,487)
Segment profit (loss)	(6,432)	(2,982)	(10,880)	1,033
Other significant items:
Provision for loan losses	0	0	0	0
Provision for losses on net investment in leases	0		0
Impairment of assets	2,983	2	2,983	3,853
Depreciation and amortization	1,271	900	2,556	2,457
Capitalized expenditures	421	1,646	1,338	2,063
Segment assets
Real estate, net	199,215		199,215		200,137
Real estate available and held for sale	5,519		5,519		8,650
Total real estate	204,734		204,734		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	57,623		57,623		61,686
Total portfolio assets	262,357		262,357		270,473
Operating Segments | Operating Properties | Operating lease income
Segment Reporting
Revenues	5,242	6,455	11,015	15,810
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	492	3,974	3,650	6,349
Operating Segments | Operating Properties | Land development revenue
Segment Reporting
Revenues	0	0	0	0
Cost of sales expense	0	0	0	0
Operating Segments | Operating Properties | Real estate expense
Segment Reporting
Cost of sales expense	(4,509)	(8,288)	(12,173)	(19,321)
Operating Segments | Land and Development
Segment Reporting
Earnings from equity method investments	48	2,924	632	3,211
Selling profit from sales-type leases		0		0
Income from sales of real estate	0	0	0	0
Total revenue and other earnings	16,798	13,380	98,289	29,887
Other expense	0	0	0	0
Allocated interest expense	(4,422)	(5,493)	(8,992)	(10,620)
Allocated general and administrative	(2,385)	(2,923)	(5,204)	(6,180)
Segment profit (loss)	(9,929)	(12,253)	(21,493)	(27,380)
Other significant items:
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	1,472	1,100
Depreciation and amortization	243	244	486	490
Capitalized expenditures	8,026	29,414	20,052	65,493
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	504,577		504,577		580,545
Loans receivable and other lending investments, net	0		0		0
Other investments	37,079		37,079		42,866
Total portfolio assets	541,656		541,656		623,411
Operating Segments | Land and Development | Operating lease income
Segment Reporting
Revenues	70	70	178	147
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	1,103	1,311	1,727	4,755
Operating Segments | Land and Development | Land development revenue
Segment Reporting
Revenues	15,577	9,075	95,752	21,774
Cost of sales expense	(16,287)	(9,236)	(93,346)	(23,684)
Operating Segments | Land and Development | Real estate expense
Segment Reporting
Cost of sales expense	(3,633)	(7,981)	(12,240)	(16,783)
Corporate/Other
Segment Reporting
Earnings from equity method investments	(1,321)	(236)	(2,158)	(34)
Selling profit from sales-type leases		0		0
Income from sales of real estate	0	0	0	0
Total revenue and other earnings	(1,084)	1,060	10,067	4,646
Other expense	(182)	(11,836)	(236)	(12,080)
Allocated interest expense	(4,998)	(4,169)	(10,883)	(12,522)
Allocated general and administrative	(4,522)	(4,936)	(9,830)	(9,881)
Segment profit (loss)	(10,786)	(19,881)	(10,882)	(29,837)
Other significant items:
Provision for loan losses	0	0	0	0
Provision for losses on net investment in leases	0		0
Impairment of assets	0	0	0	0
Depreciation and amortization	299	302	601	607
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	56,838		56,838		43,255
Total portfolio assets	56,838		56,838		$ 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	237	1,296	12,225	4,680
Corporate/Other | Land development revenue
Segment Reporting
Revenues	0	0	0	0
Cost of sales expense	0	0	0	0
Corporate/Other | Real estate expense
Segment Reporting
Cost of sales expense	$ 0	$ 0	$ 0	$ 0

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