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Stockholders' Equity | 12 Months Ended
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Dec. 31, 2018
Equity [Abstract] |
Accumulated Other Comprehensive Income (Loss) | S TOCKHOLDERS' E QUITY Accumulated Other Comprehensive (Loss) Defined benefit pension and postretirement plan items, unrealized gains (losses) of our propane swap agreements, call options and natural gas futures and swap contracts, designated as commodity contracts cash flow hedges, are the components of our accumulated comprehensive income (loss). In 2018, we elected early adoption of ASU 2018-02, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. Accordingly, we reclassified stranded tax effects resulting from the TCJA from accumulated other comprehensive loss to retained earnings, related to our employee benefit plans and commodity contracts cash flow hedges. 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 | )
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. Amortization of defined benefit pension and postretirement plan items is included in other expense, net and gains and losses on propane swap agreements, call options and natural gas futures contracts are included in cost of sales in the accompanying consolidated statements of income. The income tax benefit is included in income tax expense in the accompanying consolidated statements of income.

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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 + Details
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