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Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Statement of Comprehensive Income [Abstract]    
Net Income $ 36,933 $ 34,466
Amortization of prior service cost, net of tax of $(5) and $(5), respectively (14) (14)
Net gain, net of tax of $28, $28, $53 and $55, respectively (32) (77)
Unrealized gain on commodity contract cash flow hedges, net of tax of $185 and $63, respectively 529 166
Unrealized gain/(loss) on interest rate swap cash flow hedges, net of tax of $2, $(14), $1 and $(14), respectively 0 (2)
Other comprehensive income (loss) 547 227
Comprehensive Income (Loss), Net of Tax, Attributable to Parent $ 37,480 $ 34,693