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Accumulated Other Comprehensive Loss - Reclassification out of Accumulated Other Comprehensive Income (Details) - Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] - Reclassification out of Accumulated Other Comprehensive Income [Member] - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Amortization of net prior service cost $ (200) $ (200) $ (600) $ (600)
Amortization of net loss 1,823 2,369 5,670 8,299
Adjustment due to effects of regulation (1,279) (1,784) (4,031) (6,525)
Other comprehensive (income) loss, defined benefit plan, reclassification adjustment from AOCI, before tax 344 385 1,039 1,174
Other comprehensive (income) loss, defined benefit plan, reclassification adjustment from AOCI, tax (72) (81) (218) (247)
Other comprehensive (income) loss, defined benefit plan, reclassification adjustment from AOCI, after tax $ 272 $ 304 $ 821 $ 927