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Postretirement Benefits - Fair Value Measurement for Pension Plan Assets by Major Category and Level of Input (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Fair value measurements of pension plan assets: |  |  |
Total | $ 1,002,049 | $ 996,879 | $ 829,866
Employee Pension Plan |  |  |
Fair value measurements of pension plan assets: |  |  |
Total | 1,002,049 | 996,879 |
Employee Pension Plan | Level 1 Fair Value |  |  |
Fair value measurements of pension plan assets: |  |  |
Total | 318,448 | 383,832 |
Employee Pension Plan | Level 2 Fair Value |  |  |
Fair value measurements of pension plan assets: |  |  |
Total | 0 | 0 |
Employee Pension Plan | Level 3 Fair Value |  |  |
Fair value measurements of pension plan assets: |  |  |
Total | 0 | 0 |
Employee Pension Plan | Net Asset Value (NAV) (1) |  |  |
Fair value measurements of pension plan assets: |  |  |
Total | 683,601 | 613,047 |
Total equity securities | Employee Pension Plan |  |  |
Fair value measurements of pension plan assets: |  |  |
Total | 357,343 | 444,407 |
Total equity securities | Employee Pension Plan | Level 1 Fair Value |  |  |
Fair value measurements of pension plan assets: |  |  |
Total | 302,703 | 372,122 |
Total equity securities | Employee Pension Plan | Level 2 Fair Value |  |  |
Fair value measurements of pension plan assets: |  |  |
Total | 0 | 0 |
Total equity securities | Employee Pension Plan | Level 3 Fair Value |  |  |
Fair value measurements of pension plan assets: |  |  |
Total | 0 | 0 |
Total equity securities | Employee Pension Plan | Net Asset Value (NAV) (1) |  |  |
Fair value measurements of pension plan assets: |  |  |
Total | 54,640 | 72,285 |
U.S. equity securities | Employee Pension Plan |  |  |
Fair value measurements of pension plan assets: |  |  |
Total | 214,942 | 261,400 |
U.S. equity securities | Employee Pension Plan | Level 1 Fair Value |  |  |
Fair value measurements of pension plan assets: |  |  |
Total | 204,588 | 244,979 |
U.S. equity securities | Employee Pension Plan | Level 2 Fair Value |  |  |
Fair value measurements of pension plan assets: |  |  |
Total | 0 | 0 |
U.S. equity securities | Employee Pension Plan | Level 3 Fair Value |  |  |
Fair value measurements of pension plan assets: |  |  |
Total | 0 | 0 |
U.S. equity securities | Employee Pension Plan | Net Asset Value (NAV) (1) |  |  |
Fair value measurements of pension plan assets: |  |  |
Total | 10,354 | 16,421 |
Non-U.S. equity securities | Employee Pension Plan |  |  |
Fair value measurements of pension plan assets: |  |  |
Total | 142,401 | 183,007 |
Non-U.S. equity securities | Employee Pension Plan | Level 1 Fair Value |  |  |
Fair value measurements of pension plan assets: |  |  |
Total | 98,115 | 127,143 |
Non-U.S. equity securities | Employee Pension Plan | Level 2 Fair Value |  |  |
Fair value measurements of pension plan assets: |  |  |
Total | 0 | 0 |
Non-U.S. equity securities | Employee Pension Plan | Level 3 Fair Value |  |  |
Fair value measurements of pension plan assets: |  |  |
Total | 0 | 0 |
Non-U.S. equity securities | Employee Pension Plan | Net Asset Value (NAV) (1) |  |  |
Fair value measurements of pension plan assets: |  |  |
Total | 44,286 | 55,864 |
Debt securities | Employee Pension Plan |  |  |
Fair value measurements of pension plan assets: |  |  |
Total | 628,961 | 540,762 |
Debt securities | Employee Pension Plan | Level 1 Fair Value |  |  |
Fair value measurements of pension plan assets: |  |  |
Total | 0 | 0 |
Debt securities | Employee Pension Plan | Level 2 Fair Value |  |  |
Fair value measurements of pension plan assets: |  |  |
Total | 0 | 0 |
Debt securities | Employee Pension Plan | Level 3 Fair Value |  |  |
Fair value measurements of pension plan assets: |  |  |
Total | 0 | 0 |
Debt securities | Employee Pension Plan | Net Asset Value (NAV) (1) |  |  |
Fair value measurements of pension plan assets: |  |  |
Total | 628,961 | 540,762 |
Other | Employee Pension Plan |  |  |
Fair value measurements of pension plan assets: |  |  |
Total | 15,745 | 11,710 |
Other | Employee Pension Plan | Level 1 Fair Value |  |  |
Fair value measurements of pension plan assets: |  |  |
Total | 15,745 | 11,710 |
Other | Employee Pension Plan | Level 2 Fair Value |  |  |
Fair value measurements of pension plan assets: |  |  |
Total | 0 | 0 |
Other | Employee Pension Plan | Level 3 Fair Value |  |  |
Fair value measurements of pension plan assets: |  |  |
Total | 0 | 0 |
Other | Employee Pension Plan | Net Asset Value (NAV) (1) |  |  |
Fair value measurements of pension plan assets: |  |  |
Total | $ 0 | $ 0 |

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