Segment Reporting Summary of Net Operating Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Straight-line rental income and expense, net	$ 25,865	$ 21,197	$ 24,605
Equity in earnings of unconsolidated joint ventures	11,944	31,406	21,444
Interest Expense	(93,442)	(89,756)	(85,006)
Depreciation and amortization expense	(353,013)	(327,223)	(312,217)
Gain on sale of properties	127,700	234,653	204,988
Impairment Charges	(5,626)	0	0
Interest and other income, net	1,721	9,941	17,234
General and Administrative Expense	(62,404)	(60,889)	(56,218)
Gain on land sales	10,458	7,445	10,334
Other operating expenses	(8,209)	(5,318)	(5,231)
Loss on debt extinguishment	(32,900)	(6,320)	(388)
Gain on involuntary conversion	(4,312)	(2,259)	0
Non-incremental costs related to successful leases	12,292	12,402	0
Income from continuing operations before income taxes	297,537	440,885	392,196
Operating Segments [Member]
Segment Reporting Information [Line Items]
Property Level Net Operating Income – Cash Basis	658,048	592,197	520,747
PNOI, continuing operations	665,811	618,121	564,356
Operating Segments [Member] | Industrial Operations
Segment Reporting Information [Line Items]
Property Level Net Operating Income – Cash Basis	653,028	588,386	515,483
Operating Segments [Member] | Non-reportable Rental Operations
Segment Reporting Information [Line Items]
Property Level Net Operating Income – Cash Basis	5,020	3,811	5,264
Operating Segments [Member] | Earnings from Service Operations
Segment Reporting Information [Line Items]
Earnings from Service Operations	6,028	6,360	8,642
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
PNOI from sold properties included in continuing operations	7,763	25,924	43,609
Straight-line rental income and expense, net	25,865	21,197	24,604
Revenues related to lease buyouts	2,863	1,611	23
Amortization of lease concessions and above and below market rents	8,984	7,802	2,332
Intercompany rents and other adjusting items	(1,473)	1,012	1,271
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Equity in earnings of unconsolidated joint ventures	11,944	31,406	21,444
Interest Expense	(93,442)	(89,756)	(85,006)
Depreciation and amortization expense	(353,013)	(327,223)	(312,217)
Gain on sale of properties	127,700	234,653	204,988
Impairment Charges	(5,626)	0	0
Interest and other income, net	1,721	9,941	17,234
General and Administrative Expense	(62,404)	(60,889)	(56,218)
Gain on land sales	10,458	7,445	10,334
Other operating expenses	(8,209)	(5,318)	(5,231)
Loss on debt extinguishment	(32,900)	(6,320)	(388)
Gain on involuntary conversion	(4,312)	(2,259)	0
Non-incremental costs related to successful leases	(12,292)	(12,402)	0
Other non-segment revenues and expenses, net	$ 1,210	$ 986	$ (3,972)