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Pensions and Other Postretirement Benefits (Unrecognized Actuarial Gains and Losses) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Unrecognized net actuarial loss $ 5,237 $ 8,169
Unrecognized prior service cost 9 2
Unamortized transition obligation 2 3
Benefit plans, accumulated other comprehensive income (loss) before tax 5,248 8,174
OPEB Plans    
Defined Benefit Plan Disclosure [Line Items]    
Unrecognized net actuarial loss 2,095 2,370
Unrecognized prior service cost 0 0
Unamortized transition obligation 0 0
Benefit plans, accumulated other comprehensive income (loss) before tax $ 2,095 $ 2,370