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Accounting Policies - Deferred Financing Costs (Details) - Senior Notes | Dec. 31, 2021 | May 24, 2021 | May 23, 2017
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2025 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, interest rate, stated percentage | 6.75% |  | 6.75%
2028 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, interest rate, stated percentage | 7.125% | 7.125% |

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