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Contingencies (Schedule of Changes in Claims) (Details) - Asbestos Litigation [Member] $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 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 | 105 | 105 | 148 | 116 | 625 | 230
New Claims | 52 | 90 | 102 | 86 | 147 | 66
Closing Number of Claims | 3,677 | 3,730 | 3,745 | 3,791 | 3,821 | 4,299
Amounts Paid (thousands) to Settle or Resolve | $ | $ 93 | $ 55 | $ 758 | $ 164 | $ 437 | $ 78

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