SCHEDULE III (Details2) - USD ($)		12 Months Ended
		Dec. 31, 2022		Dec. 31, 2021	Dec. 31, 2020
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at beginning of year	[1]	$ 4,051,325,000		$ 3,519,085,000	$ 3,264,566,000
Purchases of real estate properties		353,221,000		104,205,000	46,240,000
Development of real estate properties and value-add properties		506,154,000		415,260,000	195,446,000
Improvements to real estate properties		40,654,000		36,692,000	33,522,000
Right-of-use asset, net - ground leases		(3,244,000)		11,562,000	(924,000)
Real estate assets held for sale		0		(18,233,000)	0
Carrying amount of investments sold		(9,811,000)		(15,288,000)	(17,182,000)
Write-off of improvements		(3,878,000)		(1,958,000)	(2,583,000)
Balance at end of year	[1]	4,934,421,000	[2],[3]	4,051,325,000	3,519,085,000
Noncontrolling Interests		700,000		1,379,000	852,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at beginning of year		1,035,617,000		955,328,000	871,139,000
Depreciation expense		125,199,000		104,910,000	96,290,000
Real estate assets held for sale		0		(12,538,000)	0
Accumulated depreciation on assets sold		(6,068,000)		(10,178,000)	(9,599,000)
Other		(3,934,000)		(1,905,000)	(2,502,000)
Balance at end of year		1,150,814,000	[2],[3]	$ 1,035,617,000	$ 955,328,000
Estimated aggregate cost of real estate properties for federal income tax purposes		4,569,758,000
Estimated accumulated tax depreciation		$ 870,204,000
Buildings [Member]
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Property, Plant and Equipment, Useful Life		40 years
Minimum [Member] | Improvements and Personal Property [Member]
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Property, Plant and Equipment, Useful Life		3 years
Maximum [Member] | Improvements and Personal Property [Member]
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Property, Plant and Equipment, Useful Life		15 years
Industrial Development & Value-Add [Member]
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at end of year		$ 538,449,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at end of year		$ 1,563,000
Development properties [Member]
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Percentage of Occupation when property transfers from the development and value-add program to real estate properties		90.00%
Length of Time After Project Acquisition (for Value-add) or Shell Completion (for Developments) When Project Transfers to Real Estate Properties		1 year
Value-add properties [Member]
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Percentage of Occupation when property transfers from the development and value-add program to real estate properties		90.00%
Length of Time After Project Acquisition (for Value-add) or Shell Completion (for Developments) When Project Transfers to Real Estate Properties		1 year
Development and value-add properties [Member]
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Percentage of Occupation When Costs Ceased Being Capitalized for development and value-add properties		90.00%
Length of Time After Project Completion When Development Cost Ceased Being Capitalized		1 year

[1] Includes noncontrolling interest in joint ventures of $700,000, $1,379,000 and $852,000 at December 31, 2022, 2021 and 2020, respectively.

[2] Changes in Real Estate Properties and Development and Value-Add Properties follow:                                                                                                                                                                                                                                                                                                                                                                                    Years Ended December 31,202220212020(In thousands)Balance at beginning of year $4,051,325 3,519,085 3,264,566 Purchases of real estate properties 353,221 104,205 46,240 Development of real estate properties and value-add properties506,154 415,260 195,446 Improvements to real estate properties40,654 36,692 33,522 Right-of-use assets, net – ground leases(3,244)11,562 (924)Real estate assets held for sale— (18,233)— Carrying amount of investments sold (9,811)(15,288)(17,182)Write-off of improvements (3,878)(1,958)(2,583) Balance at end of year (1)  $4,934,421 4,051,325 3,519,085 
(1) Includes noncontrolling interest in joint ventures of $700,000, $1,379,000 and $852,000 at December 31, 2022, 2021 and 2020, respectively.
Changes in the accumulated depreciation on real estate properties follow:                                                                                                                                                                                                                                                                                                                                                                                   Years Ended December 31,202220212020(In thousands)Balance at beginning of year $1,035,617 955,328 871,139 Depreciation expense 125,199 104,910 96,290 Real estate assets held for sale— (12,538)— Accumulated depreciation on assets sold (6,068)(10,178)(9,599)Other (3,934)(1,905)(2,502)Balance at end of year $1,150,814 1,035,617 955,328 

[3] The estimated aggregate cost of real estate properties at December 31, 2022 for federal income tax purposes was approximately $4,569,758,000 before estimated accumulated tax depreciation of $870,204,000.  The federal income tax return for the year ended December 31, 2022, has not been filed and accordingly, this estimate is based on preliminary data.