Segment Reporting (Summary of Net Operating Income (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement [Line Items]
Straight-line rental income and expense, net				$ 14,497	$ 8,476
Equity in earnings of unconsolidated joint ventures		$ 10,590	$ 2,396	26,858	4,935
Interest expense		(21,072)	(22,841)	(43,579)	(46,335)
Depreciation and amortization expense		(91,729)	(86,704)	(185,302)	(172,063)
Gain on sale of properties		95,183	0	116,543	8,937
Impairment charges		0	0	0	(5,626)
Interest and other income, net		1,673	216	2,136	1,611
General and administrative expenses		(15,879)	(13,606)	(40,096)	(35,369)
Gain on land sales		9,900	6,070	11,138	6,205
Other operating expenses		(338)	(1,546)	(1,483)	(2,658)
Loss on extinguishment of debt	$ (3,900)	(3,938)	(14,972)	(4,008)	(32,778)
Gain on involuntary conversion		3,222	1,283	3,222	1,283
Non-incremental costs related to successful leases		(4,027)	(4,034)	(6,985)	(6,559)
Income from continuing operations before income taxes		181,328	40,047	266,716	59,599
Operating Segments [Member]
Statement [Line Items]
Property Level Net Operating Income – Cash Basis		184,526	158,299	360,547	312,396
Property Level Net Income, Cash Basis, Continuing Operations		185,580	162,016	363,588	320,288
Operating Segments [Member] | Industrial Operations
Statement [Line Items]
Property Level Net Operating Income – Cash Basis		183,296	157,246	358,044	309,524
Operating Segments [Member] | All Other Segments [Member]
Statement [Line Items]
Property Level Net Operating Income – Cash Basis		1,230	1,053	2,503	2,872
Operating Segments [Member] | Service Operations [Member]
Statement [Line Items]
Earnings from Service Operations		3,655	1,731	5,305	2,777
Segment Reconciling Items [Member]
Statement [Line Items]
PNOI from sold properties included in continuing operations		1,054	3,717	3,041	7,892
Straight-line rental income and expense, net		6,476	6,774	14,497	8,476
Revenues Related to Lease Buyouts		0	2,033	310	2,426
Amortization of lease concessions and above and below market rents		2,609	1,540	5,441	4,097
Intercompany rents and other adjusting items		(698)	(703)	(1,116)	(375)
Corporate, Non-Segment [Member]
Statement [Line Items]
Equity in earnings of unconsolidated joint ventures		10,590	2,396	26,858	4,935
Interest expense		(21,072)	(22,841)	(43,579)	(46,335)
Depreciation and amortization expense		(91,729)	(86,704)	(185,302)	(172,063)
Gain on sale of properties		95,183	0	116,543	8,937
Impairment charges		0	0	0	(5,626)
Interest and other income, net		1,673	216	2,136	1,611
General and administrative expenses		(15,879)	(13,606)	(40,096)	(35,369)
Gain on land sales		9,900	6,070	11,138	6,205
Other operating expenses		(338)	(1,546)	(1,483)	(2,658)
Loss on extinguishment of debt		(3,938)	(14,972)	(4,008)	(32,778)
Gain on involuntary conversion		3,222	1,283	3,222	1,283
Non-incremental costs related to successful leases		(4,027)	(4,034)	(6,985)	(6,559)
Other non-segment revenues and expenses, net		$ 121	$ 394	$ 247	$ 327