Pension Plans (Narrative) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($) plan	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) plan	Jun. 30, 2019 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Number of defined benefit plans | plan	2		2
Net periodic pension cost (income)	$ 215,000	$ 244,000	$ 431,000	$ 488,000
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Net periodic pension cost (income)	201,000	$ 198,000	403,000	$ 396,000
Contributions to plan			0
Expected contributions to plan	$ 0		$ 0