Pension Plans (Narrative) (Details)	3 Months Ended
	Mar. 31, 2020 USD ($) plan	Mar. 31, 2019 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Number of defined benefit plans | plan	2
Net periodic pension cost (income)	$ 216,000	$ 244,000
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Net periodic pension cost (income)	202,000	$ 198,000
Contributions to plan	0
Expected contributions to plan	$ 0