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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2019
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) The following table presents the changes in the balance of accumulated other comprehensive loss for the years ended December 31, 2019 and 2018. All amounts in the following tables are presented net of tax.
 
 
 
Defined Benefit Pension and Postretirement Plan Items
 
Commodity Contract Cash Flow Hedges
 
Total
(in thousands)
 
 
 
 
 
 
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
)
      Other comprehensive income/(loss) before reclassifications
 
(872
)
 
2,161

 
1,289

      Amounts reclassified from accumulated other comprehensive income/(loss)
 
1,867

 
(2,595
)
 
(728
)
Net current-period other comprehensive income/(loss)
 
995

 
(434
)
 
561

     Prior-year reclassification
 
—

 
(115
)
 
(115
)
As of December 31, 2019
 
$
(4,933
)
 
$
(1,334
)
 
$
(6,267
)
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, 2019, 2018 and 2017. 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)
 
2019
 
2018
 
2017
Amortization of defined benefit pension and postretirement plan items:
 
 
 
 
 
 
 Prior service cost (1)
 
$
77

 
$
77

 
$
77

Net gain (1)
 
(2,600
)
 
(579
)
 
(636
)
Total before income taxes
 
(2,523
)

(502
)

(559
)
       Income tax benefit (4)
 
656

 
63

 
223

Net of tax
 
$
(1,867
)

$
(439
)

$
(336
)
 
 
 
 
 
 
 
Gains and losses on commodity contracts cash flow hedges
 
 
 
 
 
 
Propane swap agreements (2)
 
$
1,520

 
$
(647
)
 
$
1,607

Natural gas swaps (2)(3)
 
7

 
197

 
(822
)
Natural gas futures (2)(3)
 
2,096

 
(2,010
)
 
(456
)
Total before income taxes
 
3,623


(2,460
)

329

Income tax impact (4)
 
(1,028
)
 
701

 
(159
)
Net of tax
 
$
2,595


$
(1,759
)

$
170

 
 
 
 
 
 
 
Total reclassifications for the period
 
$
728


$
(2,198
)

$
(166
)
 
(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.