Segment Reporting (Summary of Net Operating Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement [Line Items]
Straight-line rental income and expense, net	$ 8,021	$ 1,703
Equity in earnings of unconsolidated joint ventures	16,268	2,539
Interest expense	(22,507)	(23,494)
Depreciation and amortization expense	(93,573)	(85,359)
Gain on sale of properties	21,360	8,937
Impairment charges	0	(5,626)
Interest and other income, net	463	1,395
General and administrative expenses	(24,217)	(21,763)
Gain on land sales	1,238	135
Other operating expenses	(1,145)	(1,112)
Loss on extinguishment of debt	(70)	(17,806)
Non-incremental costs related to successful leases	(2,958)	(2,525)
Income from continuing operations before income taxes	85,388	19,552
Operating Segments [Member]
Statement [Line Items]
Property Level Net Operating Income – Cash Basis	177,754	156,465
Property Level Net Income, Cash Basis, Continuing Operations	178,008	158,994
Operating Segments [Member] | Industrial Operations
Statement [Line Items]
Property Level Net Operating Income – Cash Basis	176,481	154,646
Operating Segments [Member] | All Other Segments [Member]
Statement [Line Items]
Property Level Net Operating Income – Cash Basis	1,273	1,819
Operating Segments [Member] | Service Operations [Member]
Statement [Line Items]
Earnings from Service Operations	1,650	1,046
Segment Reconciling Items [Member]
Statement [Line Items]
PNOI from sold properties included in continuing operations	254	2,529
Straight-line rental income and expense, net	8,021	1,703
Revenues Related to Lease Buyouts	310	392
Amortization of lease concessions and above and below market rents	2,832	2,557
Intercompany rents and other adjusting items	(418)	(394)
Corporate, Non-Segment [Member]
Statement [Line Items]
Equity in earnings of unconsolidated joint ventures	16,268	2,539
Interest expense	(22,507)	(23,494)
Depreciation and amortization expense	(93,573)	(85,359)
Gain on sale of properties	21,360	8,937
Interest and other income, net	463	1,395
General and administrative expenses	(24,217)	(21,763)
Gain on land sales	1,238	135
Other operating expenses	(1,145)	(1,112)
Loss on extinguishment of debt	(70)	(17,806)
Non-incremental costs related to successful leases	(2,958)	(2,525)
Other non-segment revenues and expenses, net	$ 126	$ (67)