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Notes Payable and Unsecured Credit Facilities Schedule of maturities of long-term debt (Parenthetical) (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |  |
Repayments of unsecured debt |  | $ 300,000 | $ 250,000 | $ 150,000
Subsequent Event [Member] | Unsecured Debt [Member] | Term Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayments of unsecured debt | $ 265,000 |  |  |

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- Definition The cash outflow to repay long-term debt that is not secured by collateral. Excludes repayments of tax exempt unsecured debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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