The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Real estate property and depreciation policy (Details)	12 Months Ended
Real estate property and depreciation policy (Details)	Dec. 31, 2024 USD ($) Integer	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Real Estate Properties
Number of Reportable Segments \| Integer	1
Depreciation \| $	$ 155,240,000	$ 141,003,000	$ 125,199,000
Buildings [Member]
Real Estate Properties
Property, Plant and Equipment, Useful Life	40 years
Building Improvements \| Minimum [Member]
Real Estate Properties
Property, Plant and Equipment, Useful Life	3 years
Building Improvements \| Maximum [Member]
Real Estate Properties
Property, Plant and Equipment, Useful Life	15 years