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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) | Jun. 30, 2021 | Dec. 31, 2020
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Accounting Policies [Abstract] |  |
Restricted cash | $ 309,187,000 | $ 0
5.25% Senior Notes due 2025 | Senior unsecured notes |  |
Debt Instrument [Line Items] |  |
Debt instrument face amount | $ 300,000,000.0 |
Interest rate (percent) | 5.25% |

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