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Consolidated Statements Of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Statement of Comprehensive Income [Abstract]    
Net income (loss) $ 13,823 $ (7,011)
Other comprehensive income, before tax:    
Accumulated postretirement benefit obligation adjustment 0 (41)
Net unrealized loss on investments arising during the period (750) (391)
Reclassification adjustment for sale of securities included in net income (loss) (23) (30)
Reclassification adjustment for write-down of securities included in net income (loss) 0 482
Other comprehensive (loss) income, before tax (773) 20
Income tax benefit related to postretirement health benefits 0 (9)
Income tax benefit related to net unrealized loss on investments arising during the period (158) (87)
Income tax benefit related to reclassification adjustment for sale of securities included in net income (loss) (5) (6)
Income tax expense related to reclassification adjustment for write-down of securities included in net income (loss) 0 110
Net income tax (benefit) expense on other comprehensive (loss) income (163) 8
Other comprehensive (loss) income (610) 12
Comprehensive Income (Loss) $ 13,213 $ (6,999)