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Employee and Retiree Benefit Plans - Fair Value Measurements of Retirement Plan Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | $ 586,720 | $ 547,484
Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 124,407 | 102,651
Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 364,628 | 333,247
Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 97,685 | 111,586
U.S. |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 365,257 | 349,519
U.S. | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 124,407 | 102,651
U.S. | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 179,135 | 170,943
U.S. | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 61,715 | 75,925
U.S. | U.S. core equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 67,326 | 63,169
U.S. | U.S. core equity | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 67,326 | 63,169
U.S. | U.S. core equity | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 0 | 0
U.S. | U.S. core equity | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 0 | 0
U.S. | U.S. small/midcap |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 28,953 | 26,062
U.S. | U.S. small/midcap | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 28,953 | 26,062
U.S. | U.S. small/midcap | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 0 | 0
U.S. | U.S. small/midcap | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 0 | 0
U.S. | Hedged funds and other alternative strategies |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 42,040 | 58,864
U.S. | Hedged funds and other alternative strategies | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 0 | 0
U.S. | Hedged funds and other alternative strategies | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 0 | 0
U.S. | Hedged funds and other alternative strategies | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 42,040 | 58,864
U.S. | International commingled trust fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 76,095 | 73,783
U.S. | International commingled trust fund | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 987 | 924
U.S. | International commingled trust fund | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 55,433 | 55,798
U.S. | International commingled trust fund | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 19,675 | 17,061
U.S. | Emerging market commingled equity fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 32,058 | 25,911
U.S. | Emerging market commingled equity fund | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 10,480 | 8,011
U.S. | Emerging market commingled equity fund | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 21,578 | 17,900
U.S. | Emerging market commingled equity fund | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 0 | 0
U.S. | U.S. fixed income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 92,668 | 88,525
U.S. | U.S. fixed income | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 0 | 0
U.S. | U.S. fixed income | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 92,668 | 88,525
U.S. | U.S. fixed income | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 0 | 0
U.S. | International commingled trust fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 9,456 | 8,720
U.S. | International commingled trust fund | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 0 | 0
U.S. | International commingled trust fund | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 9,456 | 8,720
U.S. | International commingled trust fund | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 0 | 0
U.S. | Cash and equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 16,661 | 4,485
U.S. | Cash and equivalents | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 16,661 | 4,485
U.S. | Cash and equivalents | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 0 | 0
U.S. | Cash and equivalents | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 0 | 0
Foreign Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 221,463 | 197,965
Foreign Plans | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 0 | 0
Foreign Plans | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 185,493 | 162,304
Foreign Plans | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 35,970 | 35,661
Foreign Plans | Cash and equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 10,989 | 4,262
Foreign Plans | Cash and equivalents | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 0 | 0
Foreign Plans | Cash and equivalents | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 10,989 | 4,262
Foreign Plans | Cash and equivalents | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 0 | 0
Foreign Plans | Equity securities funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 74,393 | 68,878
Foreign Plans | Equity securities funds | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 0 | 0
Foreign Plans | Equity securities funds | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 74,393 | 68,878
Foreign Plans | Equity securities funds | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 0 | 0
Foreign Plans | Fixed income securities funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 45,240 | 46,582
Foreign Plans | Fixed income securities funds | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 0 | 0
Foreign Plans | Fixed income securities funds | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 45,240 | 46,582
Foreign Plans | Fixed income securities funds | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 0 | 0
Foreign Plans | Diversified pooled fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 54,871 | 42,582
Foreign Plans | Diversified pooled fund | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 0 | 0
Foreign Plans | Diversified pooled fund | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 54,871 | 42,582
Foreign Plans | Diversified pooled fund | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 0 | 0
Foreign Plans | Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 35,970 | 35,661
Foreign Plans | Other | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 0 | 0
Foreign Plans | Other | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 0 | 0
Foreign Plans | Other | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | $ 35,970 | $ 35,661

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