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Defined Benefit Pension Plans - Schedule of Accumulated Benefit Obligation in Excess of the Fair Value of Plan Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Defined Benefit Plan [Abstract] |  |
Projected benefit obligation | $ 110,656 | $ 103,059
Accumulated benefit obligation | 101,611 | 94,831
Fair value of plan assets | $ 9,059 | $ 8,807

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