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Commitments and Contingencies - Summary of Remediation Reserve Activity (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Loss Contingencies [Line Items]    
Balance at beginning of period $ 11,444 $ 11,274
Remediation expense 1,265 2,602
Net remediation payments (3,408) (2,455)
Other activity 36 23
Balance at end of the period $ 9,337 $ 11,444