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Significant Accounting Policies - Summary of Real Estate Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Accounting Policies [Abstract] |  |
Real estate under development, current (included in other current assets) | $ 55,072 | $ 14,757
Real estate and other assets held for sale (included in other current assets) | 3,710 | 5,066
Real estate under development | 277,630 | 185,508
Real estate held for investment (included in other assets, net) | 3,795 | 8,101
Total real estate | $ 340,207 | $ 213,432

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