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Retirement Benefits - Narrative (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 USD ($) employee | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Defined Contribution Plan Disclosure [Line Items] |  |  |
Employer matching contributions | $ | $ 3,029 | $ 3,147 | $ 2,630
Number of employees | 3,200 |  |
Entity number of employees, field personnel | 2,500 |  |
Contributions | $ | $ 18,847 | $ 14,905 | $ 14,980
Union Members |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Number of employees | 900 |  |
Number of employees, percent | 29.00% |  |

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