Pension Plans (Narrative) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($) plan	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) plan	Jun. 30, 2020 USD ($)
Retirement Benefits [Abstract]
Number of defined benefit plans | plan	2		2
Net periodic pension cost (income)	$ 126,000	$ 215,000	$ 317,000	$ 431,000
Contributions to plan			0
Expected contributions to plan	$ 0		$ 0