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Debt - Mortgage Debt (Details) - Fixed rate mortgage debt - USD ($) $ in Thousands | Dec. 31, 2020 | Nov. 30, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Fixed rate debt | $ 786,884 |  | $ 610,821
250 West 57th Street |  |  |
Debt Instrument [Line Items] |  |  |
Fixed rate debt | $ 180,000 | $ 180,000 | $ 0
Stated interest rate (as a percent) | 2.83% | 2.83% |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + 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 The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate. + References No definition available. + Details
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