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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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