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Postretirement Benefit Obligations - Fair Value Measurement of Plan Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total Pension Plan Assets at Fair Value | $ 89,039 | $ 86,084 | $ 77,362 | $ 71,252
Emerging Markets Region Equities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total Pension Plan Assets at Fair Value | 5,184 | 4,839 | 4,427 |
International Region Equities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total Pension Plan Assets at Fair Value | 17,618 | 16,975 | 14,370 |
United States Equities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total Pension Plan Assets at Fair Value | 41,235 | 38,324 | 31,235 |
United States Bonds |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total Pension Plan Assets at Fair Value | 22,034 | 22,988 | 20,115 |
Real Estate |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total Pension Plan Assets at Fair Value | 1,360 | 1,391 | 1,563 |
Cash Fund |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total Pension Plan Assets at Fair Value | $ 1,608 | $ 1,567 | $ 5,652 |

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