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Dispositions - Land Dispositions (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Net gain (loss) on sales of land | $ 0 | $ 0 | $ 11,825
Disposal group, disposed of by sale [Member] | Plaza Yarrow Bay Properties [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Net gain (loss) on sales of land |  |  | $ 11,800

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