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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Statement of Comprehensive Income [Abstract]        
Net income $ 2,520 $ 37,180 $ 8,212 $ 49,762
Reclassification of pension and postretirement adjustments into earnings, net of $6 and $12 tax benefit in the three and six months ended June 30, 2023, respectively, and net of $32 and $67 tax benefit in the three and six months ended June 30, 2022, respectively. 18 118 39 236
Total other comprehensive income 18 118 39 236
Comprehensive income $ 2,538 $ 37,298 $ 8,251 $ 49,998