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Contingencies (Tables) | 6 Months Ended
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Jun. 30, 2020
Commitments and Contingencies Disclosure [Abstract] |
Schedule of Loss Contingencies by Contingency [Table Text Block] | The following table sets forth the number of claims filed, the number of claims settled, dismissed or otherwise resolved, and the aggregate settlement amount during the periods presented:
Year ended December 31, | Opening Number of Claims | Claims Dismissed, Settled, or Resolved | New Claims | Closing Number of Claims | Amounts Paid (thousands) to Settle or Resolve
2015 | 3,821 |  | 116 |  | 86 |  | 3,791 |  | $ | 164 |
2016 | 3,791 |  | 148 |  | 102 |  | 3,745 |  | 758 |
2017 | 3,745 |  | 105 |  | 90 |  | 3,730 |  | 55 |
2018 | 3,730 |  | 152 |  | 106 |  | 3,684 |  | 100 |
2019 | 3,684 |  | 51 |  | 75 |  | 3,708 |  | 25 |
2020 (As of June 30) | 3,708 |  | 38 |  | 23 |  | 3,693 |  | $ | 47 |

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