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STATEMENTS OF CONSOLIDATED COMPREHENSIVE LOSS (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Other postretirement benefits liability adjustment, tax (benefit) expense $ 254 $ (36) $ 150
Net change in interest rate cash flow hedges, net of tax: $210 in 2019      
Net change in cash flow hedges:     $ 210