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Unaudited Condensed Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Statement of Comprehensive Income [Abstract]        
Net income $ 24,837 $ 8,022 $ 40,303 $ 20,238
Reclassification of pension and postretirement adjustments into earnings, net of $42 and $127 tax benefit in the three and nine months ended September 30, 2021, respectively, and net of $29 and $102 tax benefit in the three and nine months ended September 30, 2020, respectively. 143 99 429 355
Total other comprehensive income 143 99 429 355
Comprehensive income $ 24,980 $ 8,121 $ 40,732 $ 20,593