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Stockholder's Equity - Accumulated Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Mar. 31, 2018
Equity [Abstract] |
Changes in Accumulated Other Comprehensive Loss |
|  | Defined Benefit |  | Commodity |  |
|  | Pension and |  | Contracts |  |
|  | Postretirement |  | Cash Flows |  |
|  | Plan Items |  | Hedges |  | Total
(in thousands) |  |  |  |  |  |
As of December 31, 2017 |  | $ | (4,743 | ) |  | $ | 471 |  |  | $ | (4,272 | )
Other comprehensive loss before reclassifications |  | — |  |  | (2,232 | ) |  | (2,232 | )
Amounts reclassified from accumulated other comprehensive income |  | 94 |  |  | 444 |  |  | 538 |
Net current-period other comprehensive income/(loss) |  | 94 |  |  | (1,788 | ) |  | (1,694 | )
Stranded tax reclassification to retained earnings |  | (1,022 | ) |  | 115 |  |  | (907 | )
As of March 31, 2018 |  | $ | (5,671 | ) |  | $ | (1,202 | ) |  | $ | (6,873 | )
|  | Defined Benefit |  | Commodity |  |
|  | Pension and |  | Contracts |  |
|  | Postretirement |  | Cash Flows |  |
|  | Plan Items |  | Hedges |  | Total
(in thousands) |  |  |  |  |  |
As of December 31, 2016 |  | $ | (5,360 | ) |  | $ | 482 |  |  | $ | (4,878 | )
Other comprehensive income/(loss) before reclassifications |  | (9 | ) |  | 1,278 |  |  | 1,269 |
Amounts reclassified from accumulated other comprehensive income/(loss) |  | 91 |  |  | (940 | ) |  | (849 | )
Net prior-period other comprehensive income |  | 82 |  |  | 338 |  |  | 420 |
As of March 31, 2017 |  | $ | (5,278 | ) |  | $ | 820 |  |  | $ | (4,458 | )
Reclassifications out of Accumulated Other Comprehensive Income (Loss) | The following table presents amounts reclassified out of accumulated other comprehensive loss for the three months ended March 31, 2018 and 2017. Deferred gains or losses for our commodity contracts cash flows hedges are recognized in earnings upon settlement.
|  | Three Months Ended
|  | March 31,
|  | 2018 |  | 2017
(in thousands) |  |  |  |
Amortization of defined benefit pension and postretirement plan items: |  |  |  |
Prior service credit (1) |  | $ | 19 |  |  | $ | 19 |
Net loss(1) |  | (149 | ) |  | (170 | )
Total before income taxes |  | (130 | ) |  | (151 | )
Income tax benefit |  | 36 |  |  | 60 |
Net of tax |  | $ | (94 | ) |  | $ | (91 | )
Gains and losses on commodity contracts cash flow hedges: |  |  |  |
Propane swap agreements (2) |  | $ | (464 | ) |  | $ | 388 |
Natural gas swaps (2) |  | (450 | ) |  | — |
Natural gas futures (2) |  | 298 |  |  | 1,150 |
Total before income taxes |  | (616 | ) |  | 1,538 |
Income tax benefit (expense) |  | 172 |  |  | (598 | )
Net of tax |  | (444 | ) |  | 940 |
Total reclassifications for the period |  | $ | (538 | ) |  | $ | 849 |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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