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Segment Reporting - Schedule of Segments (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) segments	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)	May 31, 2019 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segments	4
Segment Reporting
Revenues	$ 173,461	$ 106,802
Earnings (losses) from equity method investments	16,612	5,309
Income from sales of real estate	0	9,407
Total revenue and other earnings	190,073	121,518
Other expense	(74)	(508)
Allocated interest expense	(43,392)	(46,577)
Allocated general and administrative	(18,001)	(16,850)
Segment profit (loss)	29,049	17,194
Other significant items:
Provision for loan losses	4,003	(97)
Provision for losses on net investment in leases	1,292	0
Impairment of assets	1,708	3,851
Depreciation and amortization	14,486	15,668
Capitalized expenditures	14,790	39,251
Segment assets
Real estate, net	1,501,089		$ 1,527,219
Real estate available and held for sale	34,391		8,650
Total real estate	1,535,480		1,535,869
Net investment in leases ($10,403 of allowances as of March 31, 2020)	409,976		418,915	$ 424,100
Land and development, net	514,064		580,545
Loans receivable and other lending investments, net ($33,264 and $28,634 of allowances as of March 31, 2020 and December 31, 2019, respectively)	850,835		827,861
Other investments	1,029,552		907,875
Total portfolio assets	4,339,907		4,271,065
Cash and other assets	882,674		814,044
Total assets	5,222,581		5,085,109
Stock-based compensation expense	16,270	4,249
Operating lease income
Segment Reporting
Revenues	47,346	58,915
Interest income
Segment Reporting
Revenues	17,216	20,375
Interest income from sales-type leases
Segment Reporting
Revenues	8,355	0
Other income
Segment Reporting
Revenues	20,368	14,813
Land development
Segment Reporting
Revenues	80,176	12,699
Cost of sales expense	(77,059)	(14,449)
Real estate
Segment Reporting
Cost of sales expense	(22,498)	(25,940)
Operating Segments | Net Lease
Segment Reporting
Earnings (losses) from equity method investments	19,531	7,230
Income from sales of real estate		0
Total revenue and other earnings	74,466	60,132
Other expense	0	0
Allocated interest expense	(24,478)	(21,766)
Allocated general and administrative	(6,989)	(5,678)
Segment profit (loss)	36,770	26,582
Other significant items:
Provision for loan losses	137	0
Provision for losses on net investment in leases	1,292
Impairment of assets	1,708	0
Depreciation and amortization	12,656	13,561
Capitalized expenditures	1,846	2,756
Segment assets
Real estate, net	1,301,176		1,327,082
Real estate available and held for sale	25,730		0
Total real estate	1,326,906		1,327,082
Net investment in leases ($10,403 of allowances as of March 31, 2020)	409,976		418,915
Land and development, net	0		0
Loans receivable and other lending investments, net ($33,264 and $28,634 of allowances as of March 31, 2020 and December 31, 2019, respectively)	43,344		44,339
Other investments	880,534		760,068
Total portfolio assets	2,660,760		2,550,404
Operating Segments | Net Lease | Operating lease income
Segment Reporting
Revenues	41,464	49,482
Operating Segments | Net Lease | Interest income
Segment Reporting
Revenues	823	0
Operating Segments | Net Lease | Interest income from sales-type leases
Segment Reporting
Revenues	8,355
Operating Segments | Net Lease | Other income
Segment Reporting
Revenues	4,293	3,420
Operating Segments | Net Lease | Land development
Segment Reporting
Revenues	0	0
Cost of sales expense	0	0
Operating Segments | Net Lease | Real estate
Segment Reporting
Cost of sales expense	(6,229)	(6,106)
Operating Segments | Real Estate Finance
Segment Reporting
Earnings (losses) from equity method investments	0	0
Income from sales of real estate		0
Total revenue and other earnings	16,699	22,564
Other expense	(19)	(265)
Allocated interest expense	(6,199)	(8,413)
Allocated general and administrative	(2,097)	(2,209)
Segment profit (loss)	8,384	11,677
Other significant items:
Provision for loan losses	3,866	(97)
Provision for losses on net investment in leases	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 ($10,403 of allowances as of March 31, 2020)	0		0
Land and development, net	0		0
Loans receivable and other lending investments, net ($33,264 and $28,634 of allowances as of March 31, 2020 and December 31, 2019, respectively)	807,491		783,522
Other investments	0		0
Total portfolio assets	807,491		783,522
Operating Segments | Real Estate Finance | Operating lease income
Segment Reporting
Revenues	0	0
Operating Segments | Real Estate Finance | Interest income
Segment Reporting
Revenues	16,393	20,375
Operating Segments | Real Estate Finance | Interest income from sales-type leases
Segment Reporting
Revenues	0
Operating Segments | Real Estate Finance | Other income
Segment Reporting
Revenues	306	2,189
Operating Segments | Real Estate Finance | Land development
Segment Reporting
Revenues	0	0
Cost of sales expense	0	0
Operating Segments | Real Estate Finance | Real estate
Segment Reporting
Cost of sales expense	0	0
Operating Segments | Operating Properties
Segment Reporting
Earnings (losses) from equity method investments	(2,667)	(2,410)
Income from sales of real estate		9,407
Total revenue and other earnings	6,264	18,728
Other expense	0	0
Allocated interest expense	(2,259)	(2,918)
Allocated general and administrative	(789)	(761)
Segment profit (loss)	(4,447)	4,016
Other significant items:
Provision for loan losses	0	0
Provision for losses on net investment in leases	0
Impairment of assets	0	3,851
Depreciation and amortization	1,284	1,557
Capitalized expenditures	917	416
Segment assets
Real estate, net	199,913		200,137
Real estate available and held for sale	8,661		8,650
Total real estate	208,574		208,787
Net investment in leases ($10,403 of allowances as of March 31, 2020)	0		0
Land and development, net	0		0
Loans receivable and other lending investments, net ($33,264 and $28,634 of allowances as of March 31, 2020 and December 31, 2019, respectively)	0		0
Other investments	60,009		61,686
Total portfolio assets	268,583		270,473
Operating Segments | Operating Properties | Operating lease income
Segment Reporting
Revenues	5,774	9,356
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
Operating Segments | Operating Properties | Other income
Segment Reporting
Revenues	3,157	2,375
Operating Segments | Operating Properties | Land development
Segment Reporting
Revenues	0	0
Cost of sales expense	0	0
Operating Segments | Operating Properties | Real estate
Segment Reporting
Cost of sales expense	(7,663)	(11,033)
Operating Segments | Land and Development
Segment Reporting
Earnings (losses) from equity method investments	584	287
Income from sales of real estate		0
Total revenue and other earnings	81,492	16,510
Other expense	0	0
Allocated interest expense	(4,570)	(5,127)
Allocated general and administrative	(2,819)	(3,257)
Segment profit (loss)	(11,562)	(15,124)
Other significant items:
Provision for loan losses	0	0
Provision for losses on net investment in leases	0
Impairment of assets	0	0
Depreciation and amortization	243	247
Capitalized expenditures	12,027	36,079
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 ($10,403 of allowances as of March 31, 2020)	0		0
Land and development, net	514,064		580,545
Loans receivable and other lending investments, net ($33,264 and $28,634 of allowances as of March 31, 2020 and December 31, 2019, respectively)	0		0
Other investments	36,672		42,866
Total portfolio assets	550,736		623,411
Operating Segments | Land and Development | Operating lease income
Segment Reporting
Revenues	108	77
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
Operating Segments | Land and Development | Other income
Segment Reporting
Revenues	624	3,447
Operating Segments | Land and Development | Land development
Segment Reporting
Revenues	80,176	12,699
Cost of sales expense	(77,059)	(14,449)
Operating Segments | Land and Development | Real estate
Segment Reporting
Cost of sales expense	(8,606)	(8,801)
Corporate/Other
Segment Reporting
Earnings (losses) from equity method investments	(836)	202
Income from sales of real estate		0
Total revenue and other earnings	11,152	3,584
Other expense	(55)	(243)
Allocated interest expense	(5,886)	(8,353)
Allocated general and administrative	(5,307)	(4,945)
Segment profit (loss)	(96)	(9,957)
Other significant items:
Provision for loan losses	0	0
Provision for losses on net investment in leases	0
Impairment of assets	0	0
Depreciation and amortization	303	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 ($10,403 of allowances as of March 31, 2020)	0		0
Land and development, net	0		0
Loans receivable and other lending investments, net ($33,264 and $28,634 of allowances as of March 31, 2020 and December 31, 2019, respectively)	0		0
Other investments	52,337		43,255
Total portfolio assets	52,337		$ 43,255
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
Corporate/Other | Other income
Segment Reporting
Revenues	11,988	3,382
Corporate/Other | Land development
Segment Reporting
Revenues	0	0
Cost of sales expense	0	0
Corporate/Other | Real estate
Segment Reporting
Cost of sales expense	$ 0	$ 0

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