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Stockholder's Equity - Accumulated Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 30, 2020
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 |  | Total
(in thousands) |  |  |  |  |  |  |  |
As of December 31, 2019 |  | $ | (4,933) |  |  | $ | (1,334) |  |  | $ | — |  |  | $ | (6,267) |
Other comprehensive income before reclassifications |  | — |  |  | 3,594 |  |  | 23 |  |  | 3,617 |
Amounts reclassified from accumulated other comprehensive income (loss) |  | 198 |  |  | (1,144) |  |  | (33) |  |  | (979) |
Net current-period other comprehensive income |  | 198 |  |  | 2,450 |  |  | (10) |  |  | 2,638 |
As of September 30, 2020 |  | $ | (4,735) |  |  | $ | 1,116 |  |  | $ | (10) |  |  | $ | (3,629) |
(in thousands) |  |  |  |  |  |  |  |
As of December 31, 2018 |  | $ | (5,928) |  |  | $ | (785) |  |  | $ | — |  |  | $ | (6,713) |
Other comprehensive income (loss) before reclassifications |  | (80) |  |  | 1,780 |  |  | — |  |  | 1,700 |
Amounts reclassified from accumulated other comprehensive income/(loss) |  | 312 |  |  | (587) |  |  | — |  |  | (275) |
Net prior-period other comprehensive income |  | 232 |  |  | 1,193 |  |  | — |  |  | 1,425 |
Prior-year reclassification |  | — |  |  | (115) |  |  | — |  |  | (115) |
As of September 30, 2019 |  | $ | (5,696) |  |  | $ | 293 |  |  | $ | — |  |  | $ | (5,403) |
Reclassifications out of Accumulated Other Comprehensive Income (Loss) | The following table presents amounts reclassified out of accumulated other comprehensive loss for the three and nine months ended September 30, 2020 and 2019. Deferred gains or losses for our commodity contracts and interest rate swap cash flow hedges are recognized in earnings upon settlement.
|  | Three Months Ended |  | Nine Months Ended
|  | September 30, |  | September 30,
|  | 2020 |  | 2019 |  | 2020 |  | 2019
(in thousands) |  |  |  |  |  |  |  |
Amortization of defined benefit pension and postretirement plan items: |  |  |  |  |  |  |  |
Prior service credit (1) |  | $ | 19 |  |  | $ | 19 |  |  | $ | 57 |  |  | $ | 58 |
Net loss(1) |  | (108) |  |  | (44) |  |  | (323) |  |  | (370) |
Total before income taxes |  | (89) |  |  | (25) |  |  | (266) |  |  | (312) |
Income tax benefit |  | 23 |  |  | 5 |  |  | 68 |  |  | 80 |
Net of tax |  | (66) |  |  | (20) |  |  | (198) |  |  | (232) |
Gains and losses on commodity contracts cash flow hedges: |  |  |  |  |  |  |  |
Propane swap agreements (2) |  | 116 |  |  | 290 |  |  | 1,581 |  |  | 1,148 |
Natural gas swaps (2)(3) |  | — |  |  | (4) |  |  | — |  |  | 7 |
Natural gas futures (2)(3) |  | — |  |  | 348 |  |  | — |  |  | (350) |
Total before income taxes |  | 116 |  |  | 634 |  |  | 1,581 |  |  | 805 |
Income tax expense |  | (32) |  |  | (179) |  |  | (437) |  |  | (218) |
Net of tax |  | 84 |  |  | 455 |  |  | 1,144 |  |  | 587 |
Gains on interest rate swap cash flow hedges: |  |  |  |  |  |  |  |
Interest rate swap agreements |  | 34 |  |  | — |  |  | 45 |  |  | — |
Total before income taxes |  | 34 |  |  | — |  |  | 45 |  |  | — |
Income tax expense |  | (9) |  |  | — |  |  | (12) |  |  | — |
Net of tax |  | 25 |  |  | — |  |  | 33 |  |  | — |
Total reclassifications for the period |  | $ | 43 |  |  | $ | 435 |  |  | $ | 979 |  |  | $ | 355 |
(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. (3) PESCO's results are reflected as discontinued operations in our condensed consolidated statements of income.

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