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Retirement Plans - Schedule of Accumulated Benefit Obligation in Excess of Fair Value of Plan Assets (Details) - United Kingdom Subsidiary - UK Plan - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 322,766	$ 281,776
Accumulated benefit obligation	322,766	281,776
Fair value of plan assets	$ 307,001	$ 264,194

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Amount of accumulated benefit obligation for defined benefit plan with accumulated benefit obligation in excess of plan assets.

+ References

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-Publisher FASB
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