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Retirement Plans - Fund Status (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Unfunded Status | $ (20,282) | $ (34,241)
Accumulated other comprehensive loss, before income taxes | (264,244) | (268,275)
Qualified Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
U.S. Qualified Plan | 53,886 | 65,909
U.K. prepaid pension asset included in "Other noncurrent assets" | (36,757) | (34,990)
US | Qualified Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
U.S. Qualified Plan | 51,645 | 63,538
U.K Plan | Qualified Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
U.S. Qualified Plan | 2,241 | 2,371
Defined Benefit Plan, Unfunded Plan | Nonqualified Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
U.S. Qualified Plan | 316 | 310
Unfunded status of nonqualified defined benefit pension plans included in "Other noncurrent liabilities" | 2,837 | 3,012
Unfunded Status | $ 20,282 | $ 34,241

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