Pension Plans (Narrative) (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) plan	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) plan	Sep. 30, 2019 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Number of defined benefit plans | plan	2		2
Net periodic pension cost (income)	$ 186,000	$ 244,000	$ 617,000	$ 732,000
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Net periodic pension cost (income)	172,000	$ 289,000	575,000	$ 690,000
Contributions to plan			0
Expected contributions to plan	$ 0		$ 0