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Consolidated Statements Of Cash Flows (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Statement of Cash Flows [Abstract]    
Deferred tax provision related to unrealized gain (loss) on investments $ 295 $ (367)
Adjustments to postretirement benefits obligation, net of deferred tax benefit provision $ 0 $ 31