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Commitments and Contingencies (Schedule of Changes in Claims) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) claim | Dec. 31, 2019 USD ($) claim | Dec. 31, 2018 USD ($) claim | Dec. 31, 2017 USD ($) claim | Dec. 31, 2016 USD ($) claim | Dec. 31, 2015 USD ($) claim
Loss Contingencies [Line Items] |  |  |  |  |  |
Closing Number of Claims | 3,615 |  |  |  |  |
Asbestos Litigation |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Opening Number of Claims | 3,708 | 3,684 | 3,730 | 3,745 | 3,791 | 3,821
Claims Dismissed, Settled, or Resolved | 152 | 51 | 152 | 105 | 148 | 116
New Claims | 59 | 75 | 106 | 90 | 102 | 86
Closing Number of Claims | 3,615 | 3,708 | 3,684 | 3,730 | 3,745 | 3,791
Amounts Paid (thousands) to Settle or Resolve | $ | $ 57 | $ 25 | $ 100 | $ 55 | $ 758 | $ 164

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