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Pensions and Other Postretirement Benefits (Components of Net Periodic Cost of Pension and Other Postretirement Benefit Plans) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Annual service cost $ 498 $ 548 $ 445
Less: employee contributions 21 35 42
Net service cost 477 513 403
Interest cost 686 674 784
Expected return on plan assets (549) (536) (630)
Amortization of actuarial losses 507 463 192
Amortization of transition obligation 1 1 5
Curtailment and settlement losses 708 0 0
Net periodic benefit cost 1,830 1,115 754
OPEB Plans      
Defined Benefit Plan Disclosure [Line Items]      
Annual service cost 108 96 100
Less: employee contributions 0 0 0
Net service cost 108 96 100
Interest cost 152 142 130
Expected return on plan assets 0 0 0
Amortization of actuarial losses 177 119 75
Amortization of transition obligation 0 0 0
Curtailment and settlement losses 0 0 0
Net periodic benefit cost $ 437 $ 357 $ 305