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Segment Reporting (Schedule of Segments) (Details) $ in Thousands	1 Months Ended	3 Months Ended								6 Months Ended	12 Months Ended
	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($) segments	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jan. 01, 2018 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segments											4
Segment Profit (Loss)
Revenue		$ 140,165	$ 122,141	$ 171,571	$ 364,245	$ 103,144	$ 119,872	$ 347,867	$ 108,319		$ 798,122	$ 679,202	$ 455,187
Earnings (losses) from equity method investments											(5,007)	13,015	77,349
Income from discontinued operations						0	$ 0	$ (173)	$ (4,766)		0	4,939	18,270
Gain from discontinued operations											0	123,418	0
Gain on consolidation of equity method investment										$ 67,900	67,877	0	0
Income from sales of real estate	$ 24,500										126,004	92,049	105,296
Total revenue and other earnings											986,996	912,623	656,102
Other expense											(6,040)	(20,954)	(5,883)
Allocated interest expense											(183,751)	(194,686)	(221,398)
Allocated general and administrative											(74,572)	(80,070)	(73,138)
Segment profit (loss)											233,163	288,380	156,154
Other Significant Items
Provision for (recovery of) loan losses											16,937
Provision for (recovery of) loan losses												(5,828)	(12,514)
Impairment of assets											147,108	32,379	14,484
Depreciation and amortization											58,699	49,033	51,660
Capitalized expenditures											204,722	166,336	169,999
Segment Assets
Real estate, net		1,771,019				1,282,031					1,771,019	1,282,031
Real estate available and held for sale		22,551				68,588					22,551	68,588
Total real estate		1,793,570				1,350,619					1,793,570	1,350,619
Land and development, net		598,218				860,311					598,218	860,311
Loans receivable and other lending investments, net		988,224				1,300,655					988,224	1,300,655
Other investments		304,275				321,241					304,275	321,241		$ 397,110
Total portfolio assets		3,684,287				3,832,826					3,684,287	3,832,826
Cash and other assets		1,329,990				898,252					1,329,990	898,252
Total assets		5,014,277				4,731,078					5,014,277	4,731,078		$ 4,806,947
Stock-based compensation expense											17,563	18,812	10,889
Operating Segments | Real Estate Finance
Segment Profit (Loss)
Earnings (losses) from equity method investments											0	0	0
Income from discontinued operations												0	0
Gain from discontinued operations												0
Gain on consolidation of equity method investment											0
Income from sales of real estate											0	0	0
Total revenue and other earnings											102,434	109,181	133,811
Other expense											(1,578)	(1,413)	(2,719)
Allocated interest expense											(40,653)	(40,359)	(57,787)
Allocated general and administrative											(12,997)	(15,223)	(15,311)
Segment profit (loss)											47,206	52,186	57,994
Other Significant Items
Provision for (recovery of) loan losses											16,937
Provision for (recovery of) loan losses												(5,828)	(12,514)
Impairment of assets											0	0	0
Depreciation and amortization											0	0	0
Capitalized expenditures											0	0	0
Segment Assets
Real estate, net		0				0					0	0
Real estate available and held for sale		0				0					0	0
Total real estate		0				0					0	0
Land and development, net		0				0					0	0
Loans receivable and other lending investments, net		988,224				1,300,655					988,224	1,300,655
Other investments		0				0					0	0
Total portfolio assets		988,224				1,300,655					988,224	1,300,655
Operating Segments | Net Lease
Segment Profit (Loss)
Earnings (losses) from equity method investments											8,479	5,086	3,567
Income from discontinued operations												4,939	18,270
Gain from discontinued operations												123,418
Gain on consolidation of equity method investment											67,877
Income from sales of real estate											45,038	87,512	21,138
Total revenue and other earnings											277,638	347,243	170,771
Other expense											0	0	0
Allocated interest expense											(63,706)	(53,710)	(65,880)
Allocated general and administrative											(20,713)	(19,563)	(17,585)
Segment profit (loss)											176,186	257,228	69,148
Other Significant Items
Provision for (recovery of) loan losses											0
Provision for (recovery of) loan losses												0	0
Impairment of assets											10,391	5,486	4,829
Depreciation and amortization											38,588	28,132	31,380
Capitalized expenditures											40,215	4,838	3,667
Segment Assets
Real estate, net		1,536,494				815,783					1,536,494	815,783
Real estate available and held for sale		1,055				0					1,055	0
Total real estate		1,537,549				815,783					1,537,549	815,783
Land and development, net		0				0					0	0
Loans receivable and other lending investments, net		0				0					0	0
Other investments		165,804				205,007					165,804	205,007
Total portfolio assets		1,703,353				1,020,790					1,703,353	1,020,790
Operating Segments | Operating Properties
Segment Profit (Loss)
Earnings (losses) from equity method investments											(1,003)	(772)	33,863
Income from discontinued operations												0	0
Gain from discontinued operations												0
Gain on consolidation of equity method investment											0
Income from sales of real estate											80,966	4,537	75,357
Total revenue and other earnings											190,001	116,565	207,029
Other expense											0	0	0
Allocated interest expense											(18,618)	(20,171)	(23,156)
Allocated general and administrative											(6,574)	(8,075)	(6,574)
Segment profit (loss)											84,239	(1,406)	94,898
Other Significant Items
Provision for (recovery of) loan losses											0
Provision for (recovery of) loan losses												0	0
Impairment of assets											79,991	6,358	5,855
Depreciation and amortization											17,417	17,684	17,887
Capitalized expenditures											19,912	35,754	56,784
Segment Assets
Real estate, net		234,525				466,248					234,525	466,248
Real estate available and held for sale		21,496				68,588					21,496	68,588
Total real estate		256,021				534,836					256,021	534,836
Land and development, net		0				0					0	0
Loans receivable and other lending investments, net		0				0					0	0
Other investments		65,643				38,761					65,643	38,761
Total portfolio assets		321,664				573,597					321,664	573,597
Operating Segments | Land and Development
Segment Profit (Loss)
Earnings (losses) from equity method investments											(3,110)	7,292	30,012
Income from discontinued operations												0	0
Gain from discontinued operations												0
Gain on consolidation of equity method investment											0
Income from sales of real estate											0	0	8,801
Total revenue and other earnings											414,477	331,270	130,746
Other expense											0	0	0
Allocated interest expense											(21,897)	(28,033)	(34,888)
Allocated general and administrative											(14,313)	(16,483)	(13,693)
Segment profit (loss)											(13,600)	64,688	(16,805)
Other Significant Items
Provision for (recovery of) loan losses											0
Provision for (recovery of) loan losses												0	0
Impairment of assets											56,726	20,535	3,800
Depreciation and amortization											1,353	1,896	1,296
Capitalized expenditures											144,595	125,744	109,548
Segment Assets
Real estate, net		0				0					0	0
Real estate available and held for sale		0				0					0	0
Total real estate		0				0					0	0
Land and development, net		598,218				860,311					598,218	860,311
Loans receivable and other lending investments, net		0				0					0	0
Other investments		65,312				63,855					65,312	63,855
Total portfolio assets		663,530				924,166					663,530	924,166
Corporate, Non-Segment [Member]
Segment Profit (Loss)
Earnings (losses) from equity method investments											(9,373)	1,409	9,907
Income from discontinued operations												0	0
Gain from discontinued operations												0
Gain on consolidation of equity method investment											0
Income from sales of real estate											0	0	0
Total revenue and other earnings											2,446	8,364	13,745
Other expense											(4,462)	(19,541)	(3,164)
Allocated interest expense											(38,877)	(52,413)	(39,687)
Allocated general and administrative											(19,975)	(20,726)	(19,975)
Segment profit (loss)											(60,868)	(84,316)	(49,081)
Other Significant Items
Provision for (recovery of) loan losses											0
Provision for (recovery of) loan losses												0	0
Impairment of assets											0	0	0
Depreciation and amortization											1,341	1,321	1,097
Capitalized expenditures											0	0	0
Segment Assets
Real estate, net		0				0					0	0
Real estate available and held for sale		0				0					0	0
Total real estate		0				0					0	0
Land and development, net		0				0					0	0
Loans receivable and other lending investments, net		0				0					0	0
Other investments		7,516				13,618					7,516	13,618
Total portfolio assets		$ 7,516				$ 13,618					7,516	13,618
Operating lease income
Segment Profit (Loss)
Revenue											208,192	187,684	191,180
Operating lease income | Operating Segments | Real Estate Finance
Segment Profit (Loss)
Revenue											0	0	0
Operating lease income | Operating Segments | Net Lease
Segment Profit (Loss)
Revenue											151,958	123,685	126,164
Operating lease income | Operating Segments | Operating Properties
Segment Profit (Loss)
Revenue											55,677	63,159	64,593
Operating lease income | Operating Segments | Land and Development
Segment Profit (Loss)
Revenue											557	840	423
Operating lease income | Corporate, Non-Segment [Member]
Segment Profit (Loss)
Revenue											0	0	0
Interest income
Segment Profit (Loss)
Revenue											97,878	106,548	129,153
Interest income | Operating Segments | Real Estate Finance
Segment Profit (Loss)
Revenue											97,878	106,548	129,153
Interest income | Operating Segments | Net Lease
Segment Profit (Loss)
Revenue											0	0	0
Interest income | Operating Segments | Operating Properties
Segment Profit (Loss)
Revenue											0	0	0
Interest income | Operating Segments | Land and Development
Segment Profit (Loss)
Revenue											0	0	0
Interest income | Corporate, Non-Segment [Member]
Segment Profit (Loss)
Revenue											0	0	0
Other income
Segment Profit (Loss)
Revenue											82,342	188,091	46,514
Other income | Operating Segments | Real Estate Finance
Segment Profit (Loss)
Revenue											4,556	2,633	4,658
Other income | Operating Segments | Net Lease
Segment Profit (Loss)
Revenue											4,286	2,603	1,632
Other income | Operating Segments | Operating Properties
Segment Profit (Loss)
Revenue											54,361	49,641	33,216
Other income | Operating Segments | Land and Development
Segment Profit (Loss)
Revenue											7,320	126,259	3,170
Other income | Corporate, Non-Segment [Member]
Segment Profit (Loss)
Revenue											11,819	6,955	3,838
Land development
Segment Profit (Loss)
Revenue											409,710	196,879	88,340
Cost of sales expense											(350,181)	(180,916)	(62,007)
Land development | Operating Segments | Real Estate Finance
Segment Profit (Loss)
Revenue											0	0	0
Cost of sales expense											0	0	0
Land development | Operating Segments | Net Lease
Segment Profit (Loss)
Revenue											0	0	0
Cost of sales expense											0	0	0
Land development | Operating Segments | Operating Properties
Segment Profit (Loss)
Revenue											0	0	0
Cost of sales expense											0	0	0
Land development | Operating Segments | Land and Development
Segment Profit (Loss)
Revenue											409,710	196,879	88,340
Cost of sales expense											(350,181)	(180,916)	(62,007)
Land development | Corporate, Non-Segment [Member]
Segment Profit (Loss)
Revenue											0	0	0
Cost of sales expense											0	0	0
Real estate
Segment Profit (Loss)
Cost of sales expense											(139,289)	(147,617)	(137,522)
Real estate | Operating Segments | Real Estate Finance
Segment Profit (Loss)
Cost of sales expense											0	0	0
Real estate | Operating Segments | Net Lease
Segment Profit (Loss)
Cost of sales expense											(17,033)	(16,742)	(18,158)
Real estate | Operating Segments | Operating Properties
Segment Profit (Loss)
Cost of sales expense											(80,570)	(89,725)	(82,401)
Real estate | Operating Segments | Land and Development
Segment Profit (Loss)
Cost of sales expense											(41,686)	(41,150)	(36,963)
Real estate | Corporate, Non-Segment [Member]
Segment Profit (Loss)
Cost of sales expense											$ 0	$ 0	$ 0

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