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Commitments and Contingencies (Schedule of Changes in Claims) (Details) - Asbestos Litigation [Member] $ in Thousands | 12 Months Ended
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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

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