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Pensions and Other Postretirement Benefits (Fair Value of Plan Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets $ 14,501 $ 17,454
Level 1 Inputs    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets 14,501 17,454
Equity securities    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets 7,221 9,271
Equity securities | Level 1 Inputs    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets 7,221 9,271
Equity securities | Level 2 Inputs    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets 0 0
Equity securities | Level 3 Inputs    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets 0 0
Fixed income securities    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets 5,309 6,629
Fixed income securities | Level 1 Inputs    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets 5,309 6,629
Fixed income securities | Level 2 Inputs    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets 0 0
Fixed income securities | Level 3 Inputs    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets 0 0
Cash and cash equivalents    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets 1,971 1,554
Cash and cash equivalents | Level 1 Inputs    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets 1,971 1,554
Cash and cash equivalents | Level 2 Inputs    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets 0 0
Cash and cash equivalents | Level 3 Inputs    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets $ 0 $ 0