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Segment Reporting - Schedule of Segments (Details) $ in Thousands		1 Months Ended	3 Months Ended		9 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) segments	Sep. 30, 2018 USD ($)	May 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segments					4
Segment Reporting
Revenues			$ 145,338	$ 122,141	$ 350,608	$ 657,956
Earnings (losses) from equity method investments			7,617	(635)	16,566	(4,581)
Selling profit from sales-type leases			0		180,416
Gain from consolidation of equity method investment	$ 67,900		0	0	0	67,877
Income from sales of real estate		$ 24,500	3,476	5,409	233,406	79,353
Total revenue and other earnings			156,431	126,915	780,996	800,605
Other expense			(407)	(298)	(12,798)	(5,180)
Allocated interest expense			(46,522)	(47,219)	(136,851)	(135,572)
Allocated general and administrative			(17,370)	(17,962)	(51,818)	(57,410)
Segment profit (loss)			20,844	17,035	436,579	178,051
Other significant items:
(Recovery of) provision for loan losses			(3,805)	200	(3,792)	18,237
Impairment of assets			0	989	4,953	11,177
Depreciation and amortization			14,199	19,979	43,586	41,857
Capitalized expenditures			31,198	67,783	103,614	155,356
Segment assets
Real estate, net			1,530,116		1,530,116			$ 1,771,019
Real estate available and held for sale			12,688		12,688			22,551
Total real estate			1,542,804		1,542,804			1,793,570
Net investment in leases			421,252		421,252		$ 424,100
Land and development, net			610,380		610,380			598,218
Loans receivable and other lending investments, net			808,289		808,289			988,224
Other investments			733,793		733,793			304,275
Total portfolio assets			4,116,518		4,116,518			3,684,287
Cash and other assets			1,463,440		1,463,440			1,329,990
Total assets			5,579,958		5,579,958			5,014,277
Stock-based compensation expense			6,740	3,651	20,694	16,245
Operating lease income
Segment Reporting
Revenues			44,110	59,109	158,210	149,516
Interest income
Segment Reporting
Revenues			19,701	22,915	60,417	74,824
Interest income from sales-type leases
Segment Reporting
Revenues			8,339	0	12,157	0
Other income
Segment Reporting
Revenues			18,270	27,808	43,133	63,951
Land development
Segment Reporting
Revenues			54,918	12,309	76,691	369,665
Cost of sales expense			(48,101)	(12,114)	(71,785)	(318,881)
Real estate
Segment Reporting
Cost of sales expense			(23,187)	(32,287)	(71,165)	(105,511)
Operating Segments | Real Estate Finance
Segment Reporting
Earnings (losses) from equity method investments			0	0	0	0
Selling profit from sales-type leases					0
Gain from consolidation of equity method investment						0
Income from sales of real estate			0	0	0	0
Total revenue and other earnings			19,027	23,668	62,056	79,095
Other expense			(49)	(179)	(359)	(869)
Allocated interest expense			(6,902)	(9,558)	(23,251)	(31,971)
Allocated general and administrative			(2,035)	(2,693)	(6,523)	(10,514)
Segment profit (loss)			10,041	11,238	31,923	35,741
Other significant items:
(Recovery of) provision for loan losses			(3,805)	200	(3,792)	18,237
Impairment of assets				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
Land and development, net			0		0			0
Loans receivable and other lending investments, net			764,055		764,055			988,224
Other investments			0		0			0
Total portfolio assets			764,055		764,055			988,224
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			18,912	22,915	59,220	74,824
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			115	753	2,836	4,271
Operating Segments | Real Estate Finance | Land development
Segment Reporting
Revenues			0	0	0	0
Cost of sales expense			0	0	0	0
Operating Segments | Real Estate Finance | Real estate
Segment Reporting
Cost of sales expense			0	0	0	0
Operating Segments | Net Lease
Segment Reporting
Earnings (losses) from equity method investments			2,848	775	13,660	7,028
Selling profit from sales-type leases					180,416
Gain from consolidation of equity method investment						67,877
Income from sales of real estate			3,458	0	223,200	24,907
Total revenue and other earnings			59,787	46,987	579,485	206,808
Other expense			0	0	0	0
Allocated interest expense			(25,176)	(16,454)	(70,548)	(44,246)
Allocated general and administrative			(6,887)	(5,740)	(19,299)	(15,179)
Segment profit (loss)			21,264	20,019	471,303	135,197
Other significant items:
(Recovery of) provision for loan losses			0	0	0	0
Impairment of assets				0	0	4,342
Depreciation and amortization			12,409	12,554	38,242	25,205
Capitalized expenditures			7,846	28,315	12,707	29,512
Segment assets
Real estate, net			1,329,896		1,329,896			1,536,494
Real estate available and held for sale			0		0			1,055
Total real estate			1,329,896		1,329,896			1,537,549
Net investment in leases			421,252		421,252
Land and development, net			0		0			0
Loans receivable and other lending investments, net			44,234		44,234			0
Other investments			586,358		586,358			165,804
Total portfolio assets			2,381,740		2,381,740			1,703,353
Operating Segments | Net Lease | Operating lease income
Segment Reporting
Revenues			38,006	45,204	136,150	104,241
Operating Segments | Net Lease | Interest income
Segment Reporting
Revenues			789	0	1,197	0
Operating Segments | Net Lease | Interest income from sales-type leases
Segment Reporting
Revenues			8,339		12,157
Operating Segments | Net Lease | Other income
Segment Reporting
Revenues			6,347	1,008	12,705	2,755
Operating Segments | Net Lease | Land development
Segment Reporting
Revenues			0	0	0	0
Cost of sales expense			0	0	0	0
Operating Segments | Net Lease | Real estate
Segment Reporting
Cost of sales expense			(6,460)	(4,774)	(18,335)	(12,186)
Operating Segments | Operating Properties
Segment Reporting
Earnings (losses) from equity method investments			4,875	(2,223)	(166)	(4,814)
Selling profit from sales-type leases					0
Gain from consolidation of equity method investment						0
Income from sales of real estate			18	5,409	10,206	54,446
Total revenue and other earnings			18,538	38,242	45,844	141,198
Other expense			0	0	0	0
Allocated interest expense			(2,393)	(4,547)	(7,859)	(14,653)
Allocated general and administrative			(727)	(1,429)	(2,214)	(5,447)
Segment profit (loss)			6,104	13,617	7,125	57,007
Other significant items:
(Recovery of) provision for loan losses			0	0	0	0
Impairment of assets				989	3,853	5,535
Depreciation and amortization			1,244	6,857	3,701	14,522
Capitalized expenditures			2,816	5,860	4,878	18,186
Segment assets
Real estate, net			200,220		200,220			234,525
Real estate available and held for sale			12,688		12,688			21,496
Total real estate			212,908		212,908			256,021
Net investment in leases			0		0
Land and development, net			0		0			0
Loans receivable and other lending investments, net			0		0			0
Other investments			60,347		60,347			65,643
Total portfolio assets			273,255		273,255			321,664
Operating Segments | Operating Properties | Operating lease income
Segment Reporting
Revenues			6,034	13,803	21,844	44,818
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
Operating Segments | Operating Properties | Other income
Segment Reporting
Revenues			7,611	21,253	13,960	46,748
Operating Segments | Operating Properties | Land development
Segment Reporting
Revenues			0	0	0	0
Cost of sales expense			0	0	0	0
Operating Segments | Operating Properties | Real estate
Segment Reporting
Cost of sales expense			(9,314)	(18,649)	(28,646)	(64,091)
Operating Segments | Land and Development
Segment Reporting
Earnings (losses) from equity method investments			(301)	161	2,910	2,726
Selling profit from sales-type leases					0
Gain from consolidation of equity method investment						0
Income from sales of real estate			0	0	0	0
Total revenue and other earnings			56,811	13,429	86,694	375,488
Other expense			0	0	0	0
Allocated interest expense			(5,268)	(5,014)	(15,888)	(16,795)
Allocated general and administrative			(3,019)	(3,576)	(9,199)	(11,128)
Segment profit (loss)			(6,990)	(16,139)	(34,362)	(550)
Other significant items:
(Recovery of) provision for loan losses			0	0	0	0
Impairment of assets				0	1,100	1,300
Depreciation and amortization			243	263	733	1,095
Capitalized expenditures			20,536	33,608	86,029	107,658
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
Land and development, net			610,380		610,380			598,218
Loans receivable and other lending investments, net			0		0			0
Other investments			42,675		42,675			65,312
Total portfolio assets			653,055		653,055			663,530
Operating Segments | Land and Development | Operating lease income
Segment Reporting
Revenues			70	102	216	457
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
Operating Segments | Land and Development | Other income
Segment Reporting
Revenues			2,124	857	6,877	2,640
Operating Segments | Land and Development | Land development
Segment Reporting
Revenues			54,918	12,309	76,691	369,665
Cost of sales expense			(48,101)	(12,114)	(71,785)	(318,881)
Operating Segments | Land and Development | Real estate
Segment Reporting
Cost of sales expense			(7,413)	(8,864)	(24,184)	(29,234)
Corporate/Other
Segment Reporting
Earnings (losses) from equity method investments			195	652	162	(9,521)
Selling profit from sales-type leases					0
Gain from consolidation of equity method investment						0
Income from sales of real estate			0	0	0	0
Total revenue and other earnings			2,268	4,589	6,917	(1,984)
Other expense			(358)	(119)	(12,439)	(4,311)
Allocated interest expense			(6,783)	(11,646)	(19,305)	(27,907)
Allocated general and administrative			(4,702)	(4,524)	(14,583)	(15,142)
Segment profit (loss)			(9,575)	(11,700)	(39,410)	(49,344)
Other significant items:
(Recovery of) provision for loan losses			0	0	0	0
Impairment of assets				0	0	0
Depreciation and amortization			303	305	910	1,035
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
Land and development, net			0		0			0
Loans receivable and other lending investments, net			0		0			0
Other investments			44,413		44,413			7,516
Total portfolio assets			44,413		44,413			$ 7,516
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
Corporate/Other | Other income
Segment Reporting
Revenues			2,073	3,937	6,755	7,537
Corporate/Other | Land development
Segment Reporting
Revenues			0	0	0	0
Cost of sales expense			0	0	0	0
Corporate/Other | Real estate
Segment Reporting
Cost of sales expense			$ 0	$ 0	$ 0	$ 0

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