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Stockholder's Equity - Accumulated Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Mar. 31, 2022
Equity [Abstract] |
Changes in Accumulated Other Comprehensive Loss |
|  | Defined Benefit |  | Commodity |  | Interest Rate |  |
|  | Pension and |  | Contracts |  | Swap |  |
|  | Postretirement |  | Cash Flow |  | Cash Flow |  |
|  | Plan Items |  | Hedges |  | Hedges (1) |  | Total
(in thousands) |  |  |  |  |  |  |  |
As of December 31, 2021 |  | $ | (3,268) |  |  | $ | 4,571 |  |  | $ | — |  |  | $ | 1,303 |
Other comprehensive income before reclassifications |  | — |  |  | 2,498 |  |  | — |  |  | 2,498 |
Amounts reclassified from accumulated other comprehensive income/(loss) |  | 18 |  |  | (1,969) |  |  | — |  |  | (1,951) |
Net current-period other comprehensive income |  | 18 |  |  | 529 |  |  | — |  |  | 547 |
As of March 31, 2022 |  | $ | (3,250) |  |  | $ | 5,100 |  |  | $ | — |  |  | $ | 1,850 |
(in thousands) |  |  |  |  |  |  |  |
As of December 31, 2020 |  | $ | (5,146) |  |  | $ | 2,309 |  |  | $ | (28) |  |  | $ | (2,865) |
Other comprehensive income before reclassifications |  | — |  |  | 2,371 |  |  | 1 |  |  | 2,372 |
Amounts reclassified from accumulated other comprehensive income/(loss) |  | 63 |  |  | (2,205) |  |  | (3) |  |  | (2,145) |
Net prior-period other comprehensive income/(loss) |  | 63 |  |  | 166 |  |  | (2) |  |  | 227 |
As of March 31, 2021 |  | $ | (5,083) |  |  | $ | 2,475 |  |  | $ | (30) |  |  | $ | (2,638) |
Reclassifications out of Accumulated Other Comprehensive Income (Loss) | The following table presents amounts reclassified out of accumulated other comprehensive income (loss) for the three months ended March 31, 2022 and 2021. Deferred gains or losses for our commodity contracts and interest rate swap cash flow hedges are recognized in earnings upon settlement.
|  | Three Months Ended |  |
|  | March 31, |  |
|  | 2022 |  | 2021 |  |  |  |
(in thousands) |  |  |  |  |  |  |  |
Amortization of defined benefit pension and postretirement plan items: |  |  |  |  |  |  |  |
Prior service credit (1) |  | $ | 19 |  |  | $ | 19 |  |  |  |  |
Net loss(1) |  | (43) |  |  | (104) |  |  |  |  |
Total before income taxes |  | (24) |  |  | (85) |  |  |  |  |
Income tax benefit |  | 6 |  |  | 22 |  |  |  |  |
Net of tax |  | $ | (18) |  |  | $ | (63) |  |  |  |  |
Gains on commodity contracts cash flow hedges: |  |  |  |  |  |  |  |
Propane swap agreements (2) |  | $ | 2,721 |  |  | $ | 3,047 |  |  |  |  |
Income tax expense |  | (752) |  |  | (842) |  |  |  |  |
Net of tax |  | $ | 1,969 |  |  | $ | 2,205 |  |  |  |  |
Gains on interest rate swap cash flow hedges: |  |  |  |  |  |  |  |
Interest rate swap agreements |  | $ | — |  |  | $ | 4 |  |  |  |  |
Income tax expense |  | — |  |  | (1) |  |  |  |  |
Net of tax |  | $ | — |  |  | $ | 3 |  |  |  |  |
Total reclassifications for the period |  | $ | 1,951 |  |  | $ | 2,145 |  |  |  |  |
(1) These amounts are included in the computation of net periodic costs (benefits). See Note 10, Employee Benefit Plans, for additional details. (2) These amounts are included in the effects of gains and losses from derivative instruments. See Note 13, Derivative Instruments, for additional details.

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