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Pensions and Other Postretirement Benefit Plans (Schedule of (Gains)/Losses Recognized in Other Comprehensive Income) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
(Gains)/losses in plan assets and benefit obligations recognized in other comprehensive income: |  |  |
Settlements/curtailments | $ (450) | $ (1,494) |
Asset/liability loss/(gain) | 1,796 | (851) | (2,955)
Amortization of actuarial (loss) | (4,480) | (5,175) | (5,439)
Amortization of prior service (cost)/credit | 4,420 | 4,454 | 4,453
Pension Plans [Member] |  |  |
(Gains)/losses in plan assets and benefit obligations recognized in other comprehensive income: |  |  |
Settlements/curtailments | (450) | (1,494) |
Asset/liability loss/(gain) | (2,794) | 6,411 | (4,408)
Amortization of actuarial (loss) | (2,253) | (2,219) | (2,628)
Amortization of prior service (cost)/credit | (68) | (34) | (36)
Currency impact | 316 | (1,389) | 1,930
Cost/(benefit) in other comprehensive income | (5,249) | 1,275 | (5,142)
Other postretirement benefits [Member] |  |  |
(Gains)/losses in plan assets and benefit obligations recognized in other comprehensive income: |  |  |
Settlements/curtailments |  |  |
Asset/liability loss/(gain) | 4,685 | (6,100) | 2,743
Amortization of actuarial (loss) | (2,227) | (2,956) | (2,811)
Amortization of prior service (cost)/credit | 4,488 | 4,488 | 4,488
Currency impact |  |  | 2
Cost/(benefit) in other comprehensive income | $ 6,946 | $ (4,568) | $ 4,422

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