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Segment Reporting (Schedule of Segments) (Details) $ in Thousands			1 Months Ended	12 Months Ended
		Jun. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2020 USD ($) segment		Dec. 31, 2019 USD ($)		Dec. 31, 2018 USD ($)	May 31, 2019 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment				4
Segment Profit (Loss)
Revenue				$ 530,949		$ 479,496		$ 798,122
Earnings (losses) from equity method investments				42,126		41,849		(5,007)
Selling profit from sales-type leases				0		180,416		0
Gain on consolidation of equity method investment		$ 67,900		0		0		67,877
Income from sales of real estate			$ 24,500	6,318		236,623		126,004
Total revenue and other earnings				579,393		938,384		986,996
Other expense				(569)		(13,120)		(6,040)
Allocated interest expense				(169,574)		(183,919)		(183,751)
Allocated general and administrative				(61,525)		(68,173)		(74,572)
Segment profit (loss)				97,505		471,083		233,163
Other significant items:
Provision for loan losses				9,052		6,482		16,937
Provision for losses on net investment in leases				1,760		0		0
Impairment of assets				7,827		13,419		147,108
Depreciation and amortization				58,092		58,259		58,699
Capitalized expenditures				53,906		136,093		204,722
Segment Assets
Real estate, net	[1]			1,484,281		1,527,219
Real estate available and held for sale	[1]			5,212		8,650
Total real estate	[1]			1,489,493		1,535,869
Net investment in leases				429,101	[1]	418,915	[1]		$ 424,100
Land and development, net	[1]			430,663		580,545
Loans receivable and other lending investments, net	[1]			732,330		827,861
Other investments	[1]			1,176,560		907,875
Total portfolio assets				4,258,147		4,271,065
Cash and other assets				603,661		814,044
Total assets	[1]			4,861,808		5,085,109
Stock-based compensation expense				39,354		30,436		17,563
Operating lease income
Segment Profit (Loss)
Revenue				188,722		206,388		208,192
Interest income
Segment Profit (Loss)
Revenue				60,116		77,654		97,878
Interest income from sales-type leases
Segment Profit (Loss)
Revenue				33,552		20,496		0
Other income
Segment Profit (Loss)
Revenue				83,857		55,363		82,342
Land development
Segment Profit (Loss)
Revenue				164,702		119,595		409,710
Cost of sales expense				(177,727)		(109,663)		(350,181)
Real estate expense
Segment Profit (Loss)
Cost of sales expense				(72,493)		(92,426)		(139,289)
Operating Segments | Net Lease
Segment Profit (Loss)
Earnings (losses) from equity method investments				56,130		29,235		8,479
Selling profit from sales-type leases						180,416
Gain on consolidation of equity method investment								67,877
Income from sales of real estate				6,056		224,654		45,038
Total revenue and other earnings				284,446		651,216		277,638
Other expense				0		0		0
Allocated interest expense				(101,208)		(95,154)		(63,706)
Allocated general and administrative				(23,223)		(25,990)		(20,713)
Segment profit (loss)				133,444		505,286		176,186
Other significant items:
Provision for loan losses				186		0		0
Provision for losses on net investment in leases				1,760
Impairment of assets				2,037		2,471		10,391
Depreciation and amortization				50,767		51,091		38,588
Capitalized expenditures				21,764		31,445		40,215
Segment Assets
Real estate, net				1,291,903		1,327,082
Real estate available and held for sale				0		0
Total real estate				1,291,903		1,327,082
Net investment in leases				429,101		418,915
Land and development, net				0		0
Loans receivable and other lending investments, net				45,398		44,339
Other investments				1,016,710		760,068
Total portfolio assets				2,783,112		2,550,404
Operating Segments | Net Lease | Operating lease income
Segment Profit (Loss)
Revenue				167,152		177,679		151,958
Operating Segments | Net Lease | Interest income
Segment Profit (Loss)
Revenue				3,440		2,018		0
Operating Segments | Net Lease | Interest income from sales-type leases
Segment Profit (Loss)
Revenue				33,552		20,496
Operating Segments | Net Lease | Other income
Segment Profit (Loss)
Revenue				18,116		16,718		4,286
Operating Segments | Net Lease | Land development
Segment Profit (Loss)
Revenue				0		0		0
Cost of sales expense				0		0		0
Operating Segments | Net Lease | Real estate expense
Segment Profit (Loss)
Cost of sales expense				(26,571)		(24,786)		(17,033)
Operating Segments | Real Estate Finance
Segment Profit (Loss)
Earnings (losses) from equity method investments				0		0		0
Selling profit from sales-type leases						0
Gain on consolidation of equity method investment								0
Income from sales of real estate				0		0		0
Total revenue and other earnings				68,651		80,582		102,434
Other expense				(266)		(462)		(1,578)
Allocated interest expense				(23,390)		(29,587)		(40,653)
Allocated general and administrative				(6,622)		(8,254)		(12,997)
Segment profit (loss)				38,373		42,279		47,206
Other significant items:
Provision for loan losses				8,866		6,482		16,937
Provision for losses on net investment in leases				0
Impairment of assets				0		0		0
Depreciation and amortization				0		0		0
Capitalized expenditures				0		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				686,932		783,522
Other investments				0		0
Total portfolio assets				686,932		783,522
Operating Segments | Real Estate Finance | Operating lease income
Segment Profit (Loss)
Revenue				0		0		0
Operating Segments | Real Estate Finance | Interest income
Segment Profit (Loss)
Revenue				56,676		75,636		97,878
Operating Segments | Real Estate Finance | Interest income from sales-type leases
Segment Profit (Loss)
Revenue				0		0
Operating Segments | Real Estate Finance | Other income
Segment Profit (Loss)
Revenue				11,975		4,946		4,556
Operating Segments | Real Estate Finance | Land development
Segment Profit (Loss)
Revenue				0		0		0
Cost of sales expense				0		0		0
Operating Segments | Real Estate Finance | Real estate expense
Segment Profit (Loss)
Cost of sales expense				0		0		0
Operating Segments | Operating Properties
Segment Profit (Loss)
Earnings (losses) from equity method investments				(16,361)		8,298		(1,003)
Selling profit from sales-type leases						0
Gain on consolidation of equity method investment								0
Income from sales of real estate				262		11,969		80,966
Total revenue and other earnings				13,180		66,074		190,001
Other expense				0		0		0
Allocated interest expense				(8,951)		(10,249)		(18,618)
Allocated general and administrative				(2,591)		(2,887)		(6,574)
Segment profit (loss)				(21,298)		17,616		84,239
Other significant items:
Provision for loan losses				0		0		0
Provision for losses on net investment in leases				0
Impairment of assets				3,052		3,853		79,991
Depreciation and amortization				5,142		4,977		17,417
Capitalized expenditures				1,636		5,617		19,912
Segment Assets
Real estate, net				192,378		200,137
Real estate available and held for sale				5,212		8,650
Total real estate				197,590		208,787
Net investment in leases				0		0
Land and development, net				0		0
Loans receivable and other lending investments, net				0		0
Other investments				58,739		61,686
Total portfolio assets				256,329		270,473
Operating Segments | Operating Properties | Operating lease income
Segment Profit (Loss)
Revenue				21,214		28,423		55,677
Operating Segments | Operating Properties | Interest income
Segment Profit (Loss)
Revenue				0		0		0
Operating Segments | Operating Properties | Interest income from sales-type leases
Segment Profit (Loss)
Revenue				0		0
Operating Segments | Operating Properties | Other income
Segment Profit (Loss)
Revenue				8,065		17,384		54,361
Operating Segments | Operating Properties | Land development
Segment Profit (Loss)
Revenue				0		0		0
Cost of sales expense				0		0		0
Operating Segments | Operating Properties | Real estate expense
Segment Profit (Loss)
Cost of sales expense				(22,936)		(35,322)		(80,570)
Operating Segments | Land and Development
Segment Profit (Loss)
Earnings (losses) from equity method investments				3,432		4,322		(3,110)
Selling profit from sales-type leases						0
Gain on consolidation of equity method investment								0
Income from sales of real estate				0		0		0
Total revenue and other earnings				187,520		132,041		414,477
Other expense				0		0		0
Allocated interest expense				(17,940)		(20,706)		(21,897)
Allocated general and administrative				(9,990)		(11,957)		(14,313)
Segment profit (loss)				(41,123)		(42,603)		(13,600)
Other significant items:
Provision for loan losses				0		0		0
Provision for losses on net investment in leases				0
Impairment of assets				2,738		6,427		56,726
Depreciation and amortization				952		977		1,353
Capitalized expenditures				30,506		99,031		144,595
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				430,663		580,545
Loans receivable and other lending investments, net				0		0
Other investments				31,200		42,866
Total portfolio assets				461,863		623,411
Operating Segments | Land and Development | Operating lease income
Segment Profit (Loss)
Revenue				356		286		557
Operating Segments | Land and Development | Interest income
Segment Profit (Loss)
Revenue				0		0		0
Operating Segments | Land and Development | Interest income from sales-type leases
Segment Profit (Loss)
Revenue				0		0
Operating Segments | Land and Development | Other income
Segment Profit (Loss)
Revenue				19,030		7,838		7,320
Operating Segments | Land and Development | Land development
Segment Profit (Loss)
Revenue				164,702		119,595		409,710
Cost of sales expense				(177,727)		(109,663)		(350,181)
Operating Segments | Land and Development | Real estate expense
Segment Profit (Loss)
Cost of sales expense				(22,986)		(32,318)		(41,686)
Corporate/Other
Segment Profit (Loss)
Earnings (losses) from equity method investments				(1,075)		(6)		(9,373)
Selling profit from sales-type leases						0
Gain on consolidation of equity method investment								0
Income from sales of real estate				0		0		0
Total revenue and other earnings				25,596		8,471		2,446
Other expense				(303)		(12,658)		(4,462)
Allocated interest expense				(18,085)		(28,223)		(38,877)
Allocated general and administrative				(19,099)		(19,085)		(19,975)
Segment profit (loss)				(11,891)		(51,495)		(60,868)
Other significant items:
Provision for loan losses				0		0		0
Provision for losses on net investment in leases				0
Impairment of assets				0		668		0
Depreciation and amortization				1,231		1,214		1,341
Capitalized expenditures				0		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
Other investments				69,911		43,255
Total portfolio assets				69,911		43,255
Corporate/Other | Operating lease income
Segment Profit (Loss)
Revenue				0		0		0
Corporate/Other | Interest income
Segment Profit (Loss)
Revenue				0		0		0
Corporate/Other | Interest income from sales-type leases
Segment Profit (Loss)
Revenue				0		0
Corporate/Other | Other income
Segment Profit (Loss)
Revenue				26,671		8,477		11,819
Corporate/Other | Land development
Segment Profit (Loss)
Revenue				0		0		0
Cost of sales expense				0		0		0
Corporate/Other | Real estate expense
Segment Profit (Loss)
Cost of sales expense				$ 0		$ 0		$ 0
[1] Refer to Note 2 for details on the Company's consolidated variable interest entities ("VIEs").

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