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Commitments and Contingencies (Schedule of Changes in Claims) (Details) - Asbestos Litigation [Member]
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
claims
Dec. 31, 2017
USD ($)
claims
Dec. 31, 2016
USD ($)
claims
Dec. 31, 2015
USD ($)
claims
Dec. 31, 2014
USD ($)
claims
Dec. 31, 2013
USD ($)
claims
Loss Contingencies [Line Items]            
Opening Number of Claims 3,730 3,745 3,791 3,821 4,299 4,463
Claims Dismissed, Settled, or Resolved 152 105 148 116 625 230
New Claims 106 90 102 86 147 66
Closing Number of Claims 3,684 3,730 3,745 3,791 3,821 4,299
Amounts Paid (thousands) to Settle or Resolve | $ $ 100 $ 55 $ 758 $ 164 $ 437 $ 78