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Stockholder's Equity - Accumulated Other Comprehensive Income (Loss)
 3 Months Ended
Mar. 31, 2019
Equity [Abstract]  
Accumulated Other Comprehensive Income (Loss)
Stockholder's Equity
Accumulated Other Comprehensive Loss
Defined benefit pension and postretirement plan items, unrealized gains (losses) of our propane swap agreements, call options natural gas swaps and futures contracts, designated as commodity contracts cash flow hedges, are the components of our accumulated other comprehensive loss. The following tables present the changes in the balance of accumulated other comprehensive (loss)/income as of March 31, 2019 and 2018. All amounts except the stranded tax reclassification are presented net of tax.
 
 
Defined Benefit
 
Commodity
 
 
 
 
Pension and
 
Contracts
 
 
 
 
Postretirement
 
Cash Flow
 
 
 
 
Plan Items
 
Hedges
 
Total
(in thousands)
 
 
 
 
 
 
As of December 31, 2018
 
$
(5,928
)
 
$
(785
)
 
$
(6,713
)
Other comprehensive income before reclassifications
 
—

 
3,021

 
3,021

Amounts reclassified from accumulated other comprehensive income/(loss)
 
107

 
(39
)
 
68

Net current-period other comprehensive income
 
107

 
2,982

 
3,089

Prior-year reclassification
 
—

 
(115
)
 
(115
)
As of March 31, 2019
 
$
(5,821
)
 
$
2,082

 
$
(3,739
)

(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/(loss)
 
94

 
444

 
538

Net prior-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
)

The following table presents amounts reclassified out of accumulated other comprehensive loss for the three months ended March 31, 2019 and 2018. Deferred gains or losses for our commodity contracts cash flow hedges are recognized in earnings upon settlement.
 
 
Three Months Ended
 
 
March 31,
 
 
2019
 
2018
(in thousands)
 
 
 
 
Amortization of defined benefit pension and postretirement plan items:
 
 
 
 
Prior service credit (1)
 
$
19

 
$
19

Net loss(1)
 
(163
)
 
(149
)
Total before income taxes
 
(144
)

(130
)
Income tax benefit
 
37

 
36

Net of tax
 
$
(107
)
 
$
(94
)
Gains and losses on commodity contracts cash flow hedges:
 
 
 
 
Propane swap agreements (2)
 
$
606

 
$
(464
)
Natural gas swaps (2)
 
11

 
(450
)
Natural gas futures (2)
 
(573
)
 
298

Total before income taxes
 
44

 
(616
)
Income tax benefit (expense)
 
(5
)
 
172

Net of tax
 
39

 
(444
)
Total reclassifications for the period
 
$
(68
)
 
$
(538
)

(1) These amounts are included in the computation of net periodic costs (benefits). See Note 9, Employee Benefit Plans, for additional details.
(2) These amounts are included in the effects of gains and losses from derivative instruments. See Note 12, Derivative Instruments, for additional details.
Amortization of defined benefit pension and postretirement plan items is included in operations expense, and gains and losses on propane swap agreements, call options and natural gas futures contracts are included in cost of sales in the accompanying condensed consolidated statements of income. The income tax benefit is included in income tax expense in the accompanying condensed consolidated statements of income.