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Litigation (Narrative) (Details) - USD ($)
$ in Thousands
1 Months Ended
Apr. 30, 2018
Jul. 31, 2017
Dec. 31, 2021
Jun. 30, 2021
Jun. 30, 2018
Aug. 31, 2016
Litigation [Abstract]            
Estimated amount of possible loss           $ 3,600
Environmental remediation $ 3,600 $ 5,500        
Liabilities     $ 168,690 $ 128,811 $ 3,600