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Stockholder's Equity - Accumulated Other Comprehensive Income (Loss) (Tables)
 3 Months Ended
Mar. 31, 2019
Equity [Abstract]  
Changes in Accumulated Other Comprehensive Loss
 
 
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
)
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, 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.