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Commitments and Contingencies (Schedule of Changes in Claims) (Details) - Asbestos Litigation [Member]
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
claims
Dec. 31, 2016
USD ($)
claims
Dec. 31, 2015
USD ($)
claims
Dec. 31, 2014
USD ($)
claims
Dec. 31, 2013
USD ($)
claims
Dec. 31, 2012
USD ($)
claims
Loss Contingencies [Line Items]            
Opening Number of Claims 3,745 3,791 3,821 4,299 4,463 4,446
Claims Dismissed, Settled, or Resolved 105 148 116 625 230 90
New Claims 90 102 86 147 66 107
Closing Number of Claims 3,730 3,745 3,791 3,821 4,299 4,463
Amounts Paid (thousands) to Settle or Resolve | $ $ 55 $ 758 $ 164 $ 437 $ 78 $ 530