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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	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Amortization of net prior service cost	$ (793)	$ (794)	$ (794)
Amortization of net loss	38,070	5,586	17,074
Adjustment due to effects of regulation	(33,050)	(10,006)	(19,309)
Other comprehensive (income) loss, defined benefit plan, reclassification adjustment from AOCI, before tax	4,227	(5,214)	(3,029)
Other comprehensive (income) loss, defined benefit plan, reclassification adjustment from AOCI, tax	(888)	1,095	636
Other comprehensive (income) loss, defined benefit plan, reclassification adjustment from AOCI, after tax	$ 3,339	$ (4,119)	$ (2,393)

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- Definition

Other comprehensive income (loss) adjustment from AOCI pension and other postretirement benefit plans for net prior service cost , adjustment due to effects of regulation

+ References

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- Definition

Amount, before tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan.

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Amount, before tax, of reclassification adjustment from accumulated other comprehensive (income) loss for net period benefit cost (credit) of defined benefit plan.

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Amount, before tax, of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan.

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Amount of tax (expense) benefit for reclassification adjustment from accumulated other comprehensive (income) loss of defined benefit plan.

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