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Contingencies (Schedule of Changes in Claims) (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 USD ($) claim | Dec. 31, 2020 USD ($) claim | Dec. 31, 2019 USD ($) claim | Dec. 31, 2018 USD ($) claim | Dec. 31, 2017 USD ($) claim | Dec. 31, 2016 USD ($) claim
Loss Contingencies [Line Items] |  |  |  |  |  |
Closing Number of Claims | 3,617 |  |  |  |  |
Asbestos Issue |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Opening Number of Claims | 3,615 | 3,708 | 3,684 | 3,730 | 3,745 | 3,791
Claims Dismissed, Settled, or Resolved | 5 | 152 | 51 | 152 | 105 | 148
New Claims | 7 | 59 | 75 | 106 | 90 | 102
Closing Number of Claims | 3,617 | 3,615 | 3,708 | 3,684 | 3,730 | 3,745
Amounts Paid (thousands) to Settle or Resolve | $ | $ 0 | $ 57 | $ 25 | $ 100 | $ 55 | $ 758

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