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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 ($)	Sep. 30, 2018 USD ($)		Sep. 30, 2017 USD ($)		Sep. 30, 2018 USD ($) segments		Sep. 30, 2017 USD ($)		Dec. 31, 2017 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segments						4
Segment profit (loss)
Revenues		$ 122,141		$ 119,872		$ 657,956		$ 576,059
Earnings (losses) from equity method investments		(635)		2,461		(4,581)		13,677
Gain on consolidation of equity method investment		0		0		67,877		0
Income from discontinued operations		0		0		0		4,939
Gain from discontinued operations		0		0		0		123,418
Income from sales of real estate	$ 24,500	5,409	[1]	19,313	[1]	79,353	[1]	28,267	[1]
Total revenue and other earnings		126,915		141,646		800,605		746,360
Other expense		(298)		(2,704)		(5,180)		(20,849)
Allocated interest expense		(47,219)		(48,732)		(135,572)		(148,684)
Allocated general and administrative		(17,962)		(18,021)		(57,410)		(60,617)
Segment profit (loss)		17,035		8,397		178,051		243,768
Other significant items:
Provision for loan losses		200		(2,600)		18,237		(8,128)
Impairment of assets		989		595		11,177		15,292
Depreciation and amortization		19,979		11,846		41,857		37,297
Capitalized expenditures		67,783		43,816		155,356		118,947
Segment assets
Real estate, net		1,893,789				1,893,789				$ 1,282,031
Real estate available and held for sale		61,549				61,549				68,588
Total real estate		1,955,338				1,955,338				1,350,619
Land and development, net		650,531				650,531				860,311
Loans receivable and other lending investments, net		1,029,052				1,029,052				1,300,655
Other investments		302,318				302,318				321,241
Total portfolio assets		3,937,239				3,937,239				3,832,826
Cash and other assets		1,142,750				1,142,750				898,252
Total assets		5,079,989				5,079,989				4,731,078
Stock-based compensation expense		3,651		2,934		16,245		12,730
Operating lease income
Segment profit (loss)
Revenues		59,109		47,806		149,516		142,155
Interest income
Segment profit (loss)
Revenues		22,915		25,442		74,824		83,145
Other income
Segment profit (loss)
Revenues		27,808		20,662		63,951		172,037
Land development
Segment profit (loss)
Revenues		12,309		25,962		369,665		178,722
Cost of sales expense		(12,114)		(27,512)		(318,881)		(165,888)
Real estate
Segment profit (loss)
Cost of sales expense		(32,287)		(36,280)		(105,511)		(106,554)
Operating Segments | Real Estate Finance
Segment profit (loss)
Earnings (losses) from equity method investments		0		0		0		0
Gain on consolidation of equity method investment						0
Income from discontinued operations								0
Gain from discontinued operations								0
Income from sales of real estate		0		0		0		0
Total revenue and other earnings		23,668		26,740		79,095		84,999
Other expense		(179)		(261)		(869)		(1,263)
Allocated interest expense		(9,558)		(9,165)		(31,971)		(31,561)
Allocated general and administrative		(2,693)		(3,334)		(10,514)		(11,621)
Segment profit (loss)		11,238		13,980		35,741		40,554
Other significant items:
Provision for loan losses		200		(2,600)		18,237		(8,128)
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
Land and development, net		0				0				0
Loans receivable and other lending investments, net		1,029,052				1,029,052				1,300,655
Other investments		0				0				0
Total portfolio assets		1,029,052				1,029,052				1,300,655
Operating Segments | Real Estate Finance | Operating lease income
Segment profit (loss)
Revenues		0		0		0		0
Operating Segments | Real Estate Finance | Interest income
Segment profit (loss)
Revenues		22,915		25,442		74,824		83,145
Operating Segments | Real Estate Finance | Other income
Segment profit (loss)
Revenues		753		1,298		4,271		1,854
Operating Segments | Real Estate Finance | Land development
Segment profit (loss)
Revenues		0		0		0		0
Cost of sales expense		0		0		0		0
Operating Segments | Real Estate Finance | Real estate
Segment profit (loss)
Cost of sales expense		0		0		0		0
Operating Segments | Net Lease
Segment profit (loss)
Earnings (losses) from equity method investments		775		1,302		7,028		3,363
Gain on consolidation of equity method investment						67,877
Income from discontinued operations								4,939
Gain from discontinued operations								123,418
Income from sales of real estate		0		18,765		24,907		24,977
Total revenue and other earnings		46,987		52,523		206,808		252,312
Other expense		0		0		0		0
Allocated interest expense		(16,454)		(12,255)		(44,246)		(41,659)
Allocated general and administrative		(5,740)		(4,315)		(15,179)		(14,878)
Segment profit (loss)		20,019		31,530		135,197		182,713
Other significant items:
Provision for loan losses		0		0		0		0
Impairment of assets		0		0		4,342		219
Depreciation and amortization		12,554		6,623		25,205		21,662
Capitalized expenditures		28,315		2,384		29,512		4,071
Segment assets
Real estate, net		1,543,775				1,543,775				815,783
Real estate available and held for sale		7,289				7,289				0
Total real estate		1,551,064				1,551,064				815,783
Land and development, net		0				0				0
Loans receivable and other lending investments, net		0				0				0
Other investments		150,533				150,533				205,007
Total portfolio assets		1,701,597				1,701,597				1,020,790
Operating Segments | Net Lease | Operating lease income
Segment profit (loss)
Revenues		45,204		31,503		104,241		93,606
Operating Segments | Net Lease | Interest income
Segment profit (loss)
Revenues		0		0		0		0
Operating Segments | Net Lease | Other income
Segment profit (loss)
Revenues		1,008		953		2,755		2,009
Operating Segments | Net Lease | Land development
Segment profit (loss)
Revenues		0		0		0		0
Cost of sales expense		0		0		0		0
Operating Segments | Net Lease | Real estate
Segment profit (loss)
Cost of sales expense		(4,774)		(4,423)		(12,186)		(13,062)
Operating Segments | Operating Properties
Segment profit (loss)
Earnings (losses) from equity method investments		(2,223)		(399)		(4,814)		702
Gain on consolidation of equity method investment						0
Income from discontinued operations								0
Gain from discontinued operations								0
Income from sales of real estate		5,409		548		54,446		3,290
Total revenue and other earnings		38,242		30,294		141,198		89,689
Other expense		0		0		0		0
Allocated interest expense		(4,547)		(4,860)		(14,653)		(15,472)
Allocated general and administrative		(1,429)		(1,866)		(5,447)		(5,985)
Segment profit (loss)		13,617		383		57,007		876
Other significant items:
Provision for loan losses		0		0		0		0
Impairment of assets		989		595		5,535		5,009
Depreciation and amortization		6,857		4,343		14,522		13,305
Capitalized expenditures		5,860		7,644		18,186		24,210
Segment assets
Real estate, net		350,014				350,014				466,248
Real estate available and held for sale		54,260				54,260				68,588
Total real estate		404,274				404,274				534,836
Land and development, net		0				0				0
Loans receivable and other lending investments, net		0				0				0
Other investments		74,089				74,089				38,761
Total portfolio assets		478,363				478,363				573,597
Operating Segments | Operating Properties | Operating lease income
Segment profit (loss)
Revenues		13,803		16,048		44,818		47,977
Operating Segments | Operating Properties | Interest income
Segment profit (loss)
Revenues		0		0		0		0
Operating Segments | Operating Properties | Other income
Segment profit (loss)
Revenues		21,253		14,097		46,748		37,720
Operating Segments | Operating Properties | Land development
Segment profit (loss)
Revenues		0		0		0		0
Cost of sales expense		0		0		0		0
Operating Segments | Operating Properties | Real estate
Segment profit (loss)
Cost of sales expense		(18,649)		(23,185)		(64,091)		(67,356)
Operating Segments | Land and Development
Segment profit (loss)
Earnings (losses) from equity method investments		161		948		2,726		8,396
Gain on consolidation of equity method investment						0
Income from discontinued operations								0
Gain from discontinued operations								0
Income from sales of real estate		0		0		0		0
Total revenue and other earnings		13,429		28,339		375,488		313,120
Other expense		0		0		0		0
Allocated interest expense		(5,014)		(6,529)		(16,795)		(21,769)
Allocated general and administrative		(3,576)		(3,706)		(11,128)		(12,636)
Segment profit (loss)		(16,139)		(18,080)		(550)		86,691
Other significant items:
Provision for loan losses		0		0		0		0
Impairment of assets		0		0		1,300		10,064
Depreciation and amortization		263		546		1,095		1,337
Capitalized expenditures		33,608		33,788		107,658		90,666
Segment assets
Real estate, net		0				0				0
Real estate available and held for sale		0				0				0
Total real estate		0				0				0
Land and development, net		650,531				650,531				860,311
Loans receivable and other lending investments, net		0				0				0
Other investments		70,429				70,429				63,855
Total portfolio assets		720,960				720,960				924,166
Operating Segments | Land and Development | Operating lease income
Segment profit (loss)
Revenues		102		255		457		572
Operating Segments | Land and Development | Interest income
Segment profit (loss)
Revenues		0		0		0		0
Operating Segments | Land and Development | Other income
Segment profit (loss)
Revenues		857		1,174		2,640		125,430
Operating Segments | Land and Development | Land development
Segment profit (loss)
Revenues		12,309		25,962		369,665		178,722
Cost of sales expense		(12,114)		(27,512)		(318,881)		(165,888)
Operating Segments | Land and Development | Real estate
Segment profit (loss)
Cost of sales expense		(8,864)		(8,672)		(29,234)		(26,136)
Corporate/Other
Segment profit (loss)
Earnings (losses) from equity method investments		652		610		(9,521)		1,216
Gain on consolidation of equity method investment						0
Income from discontinued operations								0
Gain from discontinued operations								0
Income from sales of real estate		0		0		0		0
Total revenue and other earnings		4,589		3,750		(1,984)		6,240
Other expense		(119)		(2,443)		(4,311)		(19,586)
Allocated interest expense		(11,646)		(15,923)		(27,907)		(38,223)
Allocated general and administrative		(4,524)		(4,800)		(15,142)		(15,497)
Segment profit (loss)		(11,700)		(19,416)		(49,344)		(67,066)
Other significant items:
Provision for loan losses		0		0		0		0
Impairment of assets		0		0		0		0
Depreciation and amortization		305		334		1,035		993
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
Land and development, net		0				0				0
Loans receivable and other lending investments, net		0				0				0
Other investments		7,267				7,267				13,618
Total portfolio assets		7,267				7,267				$ 13,618
Corporate/Other | Operating lease income
Segment profit (loss)
Revenues		0		0		0		0
Corporate/Other | Interest income
Segment profit (loss)
Revenues		0		0		0		0
Corporate/Other | Other income
Segment profit (loss)
Revenues		3,937		3,140		7,537		5,024
Corporate/Other | Land development
Segment profit (loss)
Revenues		0		0		0		0
Cost of sales expense		0		0		0		0
Corporate/Other | Real estate
Segment profit (loss)
Cost of sales expense		$ 0		$ 0		$ 0		$ 0
[1] Income from sales of real estate represents gains from sales of real estate that do not qualify as discontinued operations

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