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Employee and Retiree Benefit Plans - Fair Value Measurements of Retirement Plan Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | $ 547,484 | $ 487,094
Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 102,651 | 86,885
Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 333,011 | 365,154
Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 111,586 | 35,055
United States |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 349,519 | 316,543
United States | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 102,651 | 86,885
United States | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 170,943 | 194,603
United States | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 75,925 | 35,055
United States | U.S. core equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 63,169 | 62,105
United States | U.S. core equity | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 63,169 | 62,105
United States | U.S. core equity | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 0 | 0
United States | U.S. core equity | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 0 | 0
United States | U.S. small/midcap |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 26,062 | 19,436
United States | U.S. small/midcap | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 26,062 | 19,436
United States | U.S. small/midcap | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 0 | 0
United States | U.S. small/midcap | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 0 | 0
United States | Hedged funds and other alternative strategies |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 58,864 | 45,844
United States | Hedged funds and other alternative strategies | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 0 | 0
United States | Hedged funds and other alternative strategies | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 0 | 10,789
United States | Hedged funds and other alternative strategies | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 58,864 | 35,055
United States | International commingled trust fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 73,783 | 63,089
United States | International commingled trust fund | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 924 | 0
United States | International commingled trust fund | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 55,798 | 63,089
United States | International commingled trust fund | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 17,061 | 0
United States | Emerging market commingled equity fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 25,911 | 15,355
United States | Emerging market commingled equity fund | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 8,011 | 0
United States | Emerging market commingled equity fund | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 17,900 | 15,355
United States | Emerging market commingled equity fund | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 0 | 0
United States | U.S. fixed income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 88,525 | 87,526
United States | U.S. fixed income | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 0 | 0
United States | U.S. fixed income | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 88,525 | 87,526
United States | U.S. fixed income | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 0 | 0
United States | International commingled trust fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 8,720 | 13,274
United States | International commingled trust fund | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 0 | 0
United States | International commingled trust fund | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 8,720 | 13,274
United States | International commingled trust fund | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 0 | 0
United States | Emerging market mutual fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets |  | 4,570
United States | Emerging market mutual fund | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets |  | 0
United States | Emerging market mutual fund | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets |  | 4,570
United States | Emerging market mutual fund | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets |  | 0
United States | Cash and equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 4,485 | 5,344
United States | Cash and equivalents | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 4,485 | 5,344
United States | Cash and equivalents | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 0 | 0
United States | 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 | 197,965 | 170,551
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 | 162,068 | 170,551
Foreign Plans | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 35,661 | 0
Foreign Plans | Cash and equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 4,262 | 3,207
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 | 4,256 | 3,207
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 | 68,878 | 67,165
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 | 68,840 | 67,165
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 | 46,582 | 89,417
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 | 46,390 | 89,417
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 | 42,582 | 10,762
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 | 42,582 | 10,762
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 | 35,661 |
Foreign Plans | Other | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 0 |
Foreign Plans | Other | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | 0 |
Foreign Plans | Other | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement plan assets | $ 35,661 |

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