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Consolidated Statements Of Cash Flows (Parenthetical) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Statement of Cash Flows [Abstract]    
Deferred tax benefit (provision) related to unrealized loss (gain) on investments $ 229 $ (333)
Adjustments to postretirement benefits obligation, net of deferred tax benefit $ 0 $ 9