Consolidated Statements Of Cash Flows (Parenthetical) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Statement of Cash Flows [Abstract]
Deferred tax benefit (provision) related to unrealized loss (gain) on investments	$ 284	$ 1,114
Deferred tax expense related to postretirement benefits obligation	$ (27)	$ (48)