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Retirement Plans and Other Benefits - Projected Benefit Obligation for Pension Plans (Details) - Pension Benefits - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Projected benefit obligation and the accumulated benefit obligation for pension plans with an accumulated obligation in excess of plan assets |  |
Projected benefit obligation | $ 177,775 | $ 3,190,626
Accumulated benefit obligation | 169,091 | 3,038,774
Fair value of plan assets | $ 0 | $ 2,733,476

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