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Lessee leases (narrative)(Details) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Jul. 01, 2021 USD ($) | May 19, 2021 USD ($) ft² | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Number of Properties Subject to Ground Leases |  |  | 4 |  | 4 | 4
Operating Lease, Payments |  |  | $ 23,599 |  | $ (1,533) | $ (1,616)
Right of use assets - operating leases |  |  | 169,778 | [1] | 146,406 |
Present value of lease payments |  |  | 204,561 |  | 201,713 |
Operating lease costs |  |  | $ 13,151 |  | $ 13,948 | $ 14,573
Property Subject to Operating Lease |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Number of Properties Subject to Ground Leases |  |  | 4 |  | 4 | 4
Sumner Square |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Lessee, Operating Lease, Description |  | for an additional 15 years. Prior to the amendment, the ground lease was scheduled to expire on August 10, 2066. The ground lease will now expire on August 9, 2081. |  |  |  |
Operating Lease, Payments | $ 23,000 |  |  |  |  |
Lessee Operating Lease Liability Payments Due, Next Five Years |  | $ 4,000 |  |  |  |
Lessee, Operating Lease, Discount Rate |  | 3.95% |  |  |  |
Operating Lease, Liability |  | $ 26,700 |  |  |  |
Right of use assets - operating leases |  | 27,100 |  |  |  |
Present value of lease payments |  | $ 26,670 | $ 3,400 |  |  |
Net Rentable Area (in sf) | ft² |  | 210,000 |  |  |  |
Operating lease costs |  |  | $ 700 |  | $ 1,400 | $ 1,500
[1] | See Note 4.

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- Definition Operating Lease, Liability (used for footnotes) + References No definition available. + Details
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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. + Details
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- Definition Description of lessee's operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918673-209980 + Details
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- Definition Discount rate used by lessee to determine present value of operating lease payments. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918673-209980 + Details
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- Definition Number of separate real estate development properties located on land subject to ground leases. + References No definition available. + Details
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- Definition Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980 + Details
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- Definition Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918643-209977 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(1) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980 + Details
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