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Stockholder's Equity - Accumulated Other Comprehensive Income (Loss) (Tables)
 9 Months Ended
Sep. 30, 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 (loss) before reclassifications
 
(80
)
 
1,780

 
1,700

Amounts reclassified from accumulated other comprehensive income (loss)
 
312

 
(587
)
 
(275
)
Net current-period other comprehensive income
 
232

 
1,193

 
1,425

Prior-year reclassification
 
—

 
(115
)
 
(115
)
As of September 30, 2019
 
$
(5,696
)
 
$
293

 
$
(5,403
)

(in thousands)
 
 
 
 
 
 
As of December 31, 2017
 
$
(4,743
)
 
$
471

 
$
(4,272
)
Other comprehensive loss before reclassifications
 
—

 
(1,126
)
 
(1,126
)
Amounts reclassified from accumulated other comprehensive income
 
275

 
1,043

 
1,318

Net prior-period other comprehensive income/(loss)
 
275

 
(83
)
 
192

Stranded tax reclassification to retained earnings
 
(1,022
)
 
115

 
(907
)
As of September 30, 2018
 
$
(5,490
)
 
$
503

 
$
(4,987
)
Reclassifications out of Accumulated Other Comprehensive Income (Loss)
The following table presents amounts reclassified out of accumulated other comprehensive loss for the three and nine months ended September 30, 2019 and 2018. Deferred gains or losses for our commodity contracts cash flow hedges are recognized in earnings upon settlement.
 
 
Three Months Ended
 
Nine Months Ended
 
 
September 30,
 
September 30,
 
 
2019
 
2018
 
2019
 
2018
(in thousands)
 
 
 
 
 
 
 
 
Amortization of defined benefit pension and postretirement plan items:
 
 
 
 
 
 
 
 
Prior service credit (1)
 
$
19

 
$
19

 
$
58

 
$
58

Net loss(1)
 
(153
)
 
(138
)
 
(480
)
 
(435
)
Total before income taxes
 
(134
)

(119
)
 
(422
)

(377
)
Income tax benefit
 
34

 
33

 
110

 
102

Net of tax
 
$
(100
)
 
$
(86
)
 
$
(312
)

$
(275
)
Gains and losses on commodity contracts cash flow hedges:
 
 
 
 
 
 
 
 
Propane swap agreements (2)
 
$
290

 
$
(276
)
 
$
1,148

 
$
(921
)
Natural gas swaps (2)(3)
 
(4
)
 
123

 
7

 
(358
)
Natural gas futures (2)(3)
 
348

 
(308
)
 
(350
)
 
(171
)
Total before income taxes
 
634

 
(461
)
 
805


(1,450
)
Income tax benefit (expense)
 
(179
)
 
129

 
(218
)
 
407

Net of tax
 
455

 
(332
)

587

 
(1,043
)
Total reclassifications for the period
 
$
355

 
$
(418
)

$
275

 
$
(1,318
)

(1) These amounts are included in the computation of net periodic costs (benefits). See Note 10, Employee Benefit Plans, for additional details.
(2) These amounts are included in the effects of gains and losses from derivative instruments. See Note 13, Derivative Instruments, for additional details.
(3) PESCO's results are reflected as discontinued operations in our condensed consolidated statements of income.