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Other Comprehensive Income and Accumulated Other Comprehensive Income - Amounts Recognized Before Tax, Defined Benefit Plans (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Equity [Abstract]    
Net actuarial loss $ (390,305) $ (399,010)
Prior service cost (1,484) (1,528)
Less: amount recognized in regulatory assets 332,088 339,356
Recognized in AOCI $ (59,701) $ (61,182)