Pensions and Other Postretirement Benefits (Fair Value of Plan Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Defined benefit pension plan assets	$ 16,420	$ 14,501
Level 1 Inputs
Defined Benefit Plan Disclosure [Line Items]
Defined benefit pension plan assets	16,420	14,501
Level 2 Inputs
Defined Benefit Plan Disclosure [Line Items]
Defined benefit pension plan assets	0	0
Level 3 Inputs
Defined Benefit Plan Disclosure [Line Items]
Defined benefit pension plan assets	0	0
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit pension plan assets	7,796	7,221
Equity securities | Level 1 Inputs
Defined Benefit Plan Disclosure [Line Items]
Defined benefit pension plan assets	7,796	7,221
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	6,975	5,309
Fixed income securities | Level 1 Inputs
Defined Benefit Plan Disclosure [Line Items]
Defined benefit pension plan assets	6,975	5,309
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	1,649	1,971
Cash and cash equivalents | Level 1 Inputs
Defined Benefit Plan Disclosure [Line Items]
Defined benefit pension plan assets	1,649	1,971
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