Pensions and Other Postretirement Benefits (Projected and Accumulated Benefit Obligations) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Retirement Benefits [Abstract]
Accumulated benefit obligation, all plans	$ 26,100	$ 23,040
Plans for which the accumulated benefit obligation exceeds plan assets:
Projected benefit obligation	25,800	22,552
Accumulated benefit obligation	25,158	22,155
Fair value of plan assets	$ 14,983	$ 13,256

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Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

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

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

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

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