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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2018
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) | The following table present the changes in the balance of accumulated other comprehensive loss for the years ended December 31, 2018 and 2017. All amounts in the following tables are presented net of tax.
|  | Defined Benefit Pension and Postretirement Plan Items |  | Commodity Contracts Cash Flow Hedges |  | Total
(in thousands) |  |  |  |  |  |
As of December 31, 2016 |  | $ | (5,360 | ) |  | $ | 482 |  |  | $ | (4,878 | )
Other comprehensive income before reclassifications |  | 281 |  |  | 159 |  |  | 440 |
Amounts reclassified from accumulated other comprehensive income/(loss) |  | 336 |  |  | (170 | ) |  | 166 |
Net current-period other comprehensive income/(loss) |  | 617 |  |  | (11 | ) |  | 606 |
As of December 31, 2017 |  | (4,743 | ) |  | 471 |  |  | (4,272 | )
Other comprehensive loss before reclassifications |  | (602 | ) |  | (3,130 | ) |  | (3,732 | )
Amounts reclassified from accumulated other comprehensive income |  | 439 |  |  | 1,759 |  |  | 2,198 |
Net current-period other comprehensive loss |  | (163 | ) |  | (1,371 | ) |  | (1,534 | )
Stranded tax reclassification to retained earnings |  | (1,022 | ) |  | 115 |  |  | (907 | )
As of December 31, 2018 |  | $ | (5,928 | ) |  | $ | (785 | ) |  | $ | (6,713 | )
Reclassification out of Accumulated Other Comprehensive Income | The following table presents amounts reclassified out of accumulated other comprehensive income (loss) for the years ended December 31, 2018, 2017 and 2016. Deferred gains and losses of our commodity contracts cash flow hedges are recognized in earnings upon settlement.
|  | For the Year Ended December 31,
(in thousands) |  | 2018 |  | 2017 |  | 2016
Amortization of defined benefit pension and postretirement plan items: |  |  |  |  |  |
Prior service cost (1) |  | $ | 77 |  |  | $ | 77 |  |  | $ | 77 |
Net gain (1) |  | (579 | ) |  | (636 | ) |  | (871 | )
Total before income taxes |  | (502 | ) |  | (559 | ) |  | (794 | )
Income tax benefit |  | 63 |  |  | 223 |  |  | 320 |
Net of tax |  | $ | (439 | ) |  | $ | (336 | ) |  | $ | (474 | )
Gains and losses on commodity contracts cash flow hedges |  |  |  |  |  |
Propane swap agreements (2) |  | $ | (647 | ) |  | $ | 1,607 |  |  | $ | (322 | )
Natural gas swaps (2) |  | 197 |  |  | (822 | ) |  | — |
Natural gas futures (2) |  | (2,010 | ) |  | (456 | ) |  | 345 |
Total before income taxes |  | (2,460 | ) |  | 329 |  |  | 23 |
Income tax impact |  | 701 |  |  | (159 | ) |  | (3 | )
Net of tax |  | $ | (1,759 | ) |  | $ | 170 |  |  | $ | 20 |
Total reclassifications for the period |  | $ | (2,198 | ) |  | $ | (166 | ) |  | $ | (454 | )
(1) These amounts are included in the computation of net periodic benefits. See Note 17, Employee Benefit Plans, for additional details. (2) These amounts are included in the effects of gains and losses from derivative instruments. See Note 8, Derivative Instruments, for additional details.

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