Commitments and Contingencies (Schedule of Changes in Claims) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) claim	Dec. 31, 2019 USD ($) claim	Dec. 31, 2018 USD ($) claim	Dec. 31, 2017 USD ($) claim	Dec. 31, 2016 USD ($) claim	Dec. 31, 2015 USD ($) claim
Loss Contingencies [Line Items]
Closing Number of Claims	3,615
Asbestos Litigation
Loss Contingencies [Line Items]
Opening Number of Claims	3,708	3,684	3,730	3,745	3,791	3,821
Claims Dismissed, Settled, or Resolved	152	51	152	105	148	116
New Claims	59	75	106	90	102	86
Closing Number of Claims	3,615	3,708	3,684	3,730	3,745	3,791
Amounts Paid (thousands) to Settle or Resolve | $	$ 57	$ 25	$ 100	$ 55	$ 758	$ 164