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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Statement of Other Comprehensive Income [Abstract]    
Amortization of prior service cost, tax $ (5) $ (5)
Net gain, tax 11 27
Unrealized (loss)/gain on commodity contract cash flow hedges, tax 185 63
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Interest Rate Swaps During Period, Tax $ 0 $ (1)