Commitments and Contingencies (Schedule of Changes in Claims) (Details) - Asbestos Litigation [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) claims	Dec. 31, 2018 USD ($) claims	Dec. 31, 2017 USD ($) claims	Dec. 31, 2016 USD ($) claims	Dec. 31, 2015 USD ($) claims	Dec. 31, 2014 USD ($) claims
Loss Contingencies [Line Items]
Opening Number of Claims	3,684	3,730	3,745	3,791	3,821	4,299
Claims Dismissed, Settled, or Resolved	51	152	105	148	116	625
New Claims	75	106	90	102	86	147
Closing Number of Claims	3,708	3,684	3,730	3,745	3,791	3,821
Amounts Paid (thousands) to Settle or Resolve | $	$ 25	$ 100	$ 55	$ 758	$ 164	$ 437