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Employee Benefit Plans - Fair Value of Plan Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments at fair value | $ 106,519 | $ 203,314 |
Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 20,252 | 21,276 | $ 18,597
United States | Qualified Defined Benefits | Qualified Defined Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 573,100 | 606,896 | 550,238
Total investments at fair value | 392,709 | 413,468 |
United States | Qualified Defined Benefits | Qualified Defined Benefits | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 3,227 | 11,650 |
Total investments at fair value | 3,227 | 11,650 |
United States | Qualified Defined Benefits | Qualified Defined Benefits | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 389,482 | 401,818 |
Total investments at fair value | 389,482 | 401,818 |
United States | Qualified Defined Benefits | Qualified Defined Benefits | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 316,367 | 329,800 |
United States | Qualified Defined Benefits | Qualified Defined Benefits | Corporate bonds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 0 | 0 |
United States | Qualified Defined Benefits | Qualified Defined Benefits | Corporate bonds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 316,367 | 329,800 |
United States | Qualified Defined Benefits | Qualified Defined Benefits | Government securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 73,115 | 80,551 |
United States | Qualified Defined Benefits | Qualified Defined Benefits | Government securities | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 0 | 8,533 |
United States | Qualified Defined Benefits | Qualified Defined Benefits | Government securities | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 73,115 | 72,018 |
United States | Qualified Defined Benefits | Qualified Defined Benefits | Interest-bearing cash and short-term investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 3,227 | 3,117 |
United States | Qualified Defined Benefits | Qualified Defined Benefits | Interest-bearing cash and short-term investments | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 3,227 | 3,117 |
United States | Qualified Defined Benefits | Qualified Defined Benefits | Interest-bearing cash and short-term investments | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 0 | 0 |
United States | Qualified Defined Benefits | Qualified Defined Benefits | Collective funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 167,551 | 180,103 |
United States | Qualified Defined Benefits | Qualified Defined Benefits | Collective funds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 0 | 0 |
United States | Qualified Defined Benefits | Qualified Defined Benefits | Collective funds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 0 | 0 |
United States | Qualified Defined Benefits | Qualified Defined Benefits | Short-term investment funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 12,840 | 13,325 |
United States | Qualified Defined Benefits | Qualified Defined Benefits | Short-term investment funds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 0 | 0 |
United States | Qualified Defined Benefits | Qualified Defined Benefits | Short-term investment funds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 0 | 0 |
Foreign Plan | Qualified Defined Benefits | Qualified Defined Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 219,677 | 212,748 | $ 185,590
Total investments at fair value | 142,526 | 133,625 |
Foreign Plan | Qualified Defined Benefits | Qualified Defined Benefits | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 92,363 | 85,100 |
Total investments at fair value | 92,363 | 85,100 |
Foreign Plan | Qualified Defined Benefits | Qualified Defined Benefits | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 29,911 | 27,249 |
Total investments at fair value | 29,911 | 27,249 |
Foreign Plan | Qualified Defined Benefits | Qualified Defined Benefits | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 20,252 | 21,276 |
Total investments at fair value | 20,252 | 21,276 |
Foreign Plan | Qualified Defined Benefits | Qualified Defined Benefits | Collective funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 72,235 | 74,138 |
Foreign Plan | Qualified Defined Benefits | Qualified Defined Benefits | Collective funds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 0 | 0 |
Foreign Plan | Qualified Defined Benefits | Qualified Defined Benefits | Collective funds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 0 | 0 |
Foreign Plan | Qualified Defined Benefits | Qualified Defined Benefits | Collective funds | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 0 | 0 |
Foreign Plan | Qualified Defined Benefits | Qualified Defined Benefits | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 3,634 | 2,822 |
Foreign Plan | Qualified Defined Benefits | Qualified Defined Benefits | Cash and cash equivalents | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 3,634 | 2,822 |
Foreign Plan | Qualified Defined Benefits | Qualified Defined Benefits | Cash and cash equivalents | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 0 | 0 |
Foreign Plan | Qualified Defined Benefits | Qualified Defined Benefits | Cash and cash equivalents | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 0 | 0 |
Foreign Plan | Qualified Defined Benefits | Qualified Defined Benefits | Common stocks |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 58,054 | 52,865 |
Foreign Plan | Qualified Defined Benefits | Qualified Defined Benefits | Common stocks | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 58,054 | 52,865 |
Foreign Plan | Qualified Defined Benefits | Qualified Defined Benefits | Common stocks | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 0 | 0 |
Foreign Plan | Qualified Defined Benefits | Qualified Defined Benefits | Common stocks | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 0 | 0 |
Foreign Plan | Qualified Defined Benefits | Qualified Defined Benefits | Fixed income investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 27,034 | 26,068 |
Foreign Plan | Qualified Defined Benefits | Qualified Defined Benefits | Fixed income investments | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 0 | 0 |
Foreign Plan | Qualified Defined Benefits | Qualified Defined Benefits | Fixed income investments | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 27,034 | 26,068 |
Foreign Plan | Qualified Defined Benefits | Qualified Defined Benefits | Fixed income investments | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 0 | 0 |
Foreign Plan | Qualified Defined Benefits | Qualified Defined Benefits | Mutual funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 30,675 | 29,413 |
Foreign Plan | Qualified Defined Benefits | Qualified Defined Benefits | Mutual funds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 30,675 | 29,413 |
Foreign Plan | Qualified Defined Benefits | Qualified Defined Benefits | Mutual funds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 0 | 0 |
Foreign Plan | Qualified Defined Benefits | Qualified Defined Benefits | Mutual funds | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 0 | 0 |
Foreign Plan | Qualified Defined Benefits | Qualified Defined Benefits | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 23,129 | 22,457 |
Foreign Plan | Qualified Defined Benefits | Qualified Defined Benefits | Other | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 0 | 0 |
Foreign Plan | Qualified Defined Benefits | Qualified Defined Benefits | Other | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 2,877 | 1,181 |
Foreign Plan | Qualified Defined Benefits | Qualified Defined Benefits | Other | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 20,252 | 21,276 |
Foreign Plan | Qualified Defined Benefits | Qualified Defined Benefits | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 4,916 | 4,985 |
Foreign Plan | Qualified Defined Benefits | Qualified Defined Benefits | Other | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 0 | 0 |
Foreign Plan | Qualified Defined Benefits | Qualified Defined Benefits | Other | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 0 | 0 |
Foreign Plan | Qualified Defined Benefits | Qualified Defined Benefits | Other | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | $ 0 | $ 0 |

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