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Disposition of Properties (Details) $ in Thousands				3 Months Ended
	Mar. 10, 2023 USD ($) property	Dec. 28, 2022 USD ($)	Aug. 31, 2022 USD ($) property	Mar. 31, 2023 USD ($)
Dispositions of properties
Gain (loss) on sale of property				$ 8,392
Office properties in Broomfield, Colorado
Dispositions of properties
Number of properties sold | property			2
Gain (loss) on sale of property			$ 24,100
Sale price			$ 102,500
Office Property in Evanston, Illinois
Dispositions of properties
Gain (loss) on sale of property		$ 3,900
Sale price		$ 27,800
Office Property in Elk Grove Village, Illinois
Dispositions of properties
Number of properties sold | property	1
Gain (loss) on sale of property	$ 8,400
Sale price	$ 29,100

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- Definition

Represents the number of office properties sold.

+ References

No definition available.

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- Definition

The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 5
-URI https://asc.fasb.org/extlink&oid=126905981&loc=d3e2443-110228

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The cash inflow from the sale of formerly productive land held for sale, anything permanently fixed to it, including buildings, structures on it, and so forth.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
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-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3179-108585

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