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Stockholder's Equity - Accumulated Other Comprehensive Income (Loss) (Tables)
 6 Months Ended
Jun. 30, 2018
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, 2017
 
$
(4,743
)
 
$
471

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

 
(1,440
)
 
(1,440
)
Amounts reclassified from accumulated other comprehensive income
 
189

 
712

 
901

Net current-period other comprehensive income/(loss)
 
189

 
(728
)
 
(539
)
Stranded tax reclassification to retained earnings
 
(1,022
)
 
115

 
(907
)
As of June 30, 2018
 
$
(5,576
)
 
$
(142
)
 
$
(5,718
)


 
 
Defined Benefit
 
Commodity
 
 
 
 
Pension and
 
Contracts
 
 
 
 
Postretirement
 
Cash Flow
 
 
 
 
Plan Items
 
Hedges
 
Total
(in thousands)
 
 
 
 
 
 
As of December 31, 2016
 
$
(5,360
)
 
$
482

 
$
(4,878
)
Other comprehensive (loss)/income before reclassifications
 
(9
)
 
837

 
828

Amounts reclassified from accumulated other comprehensive income/(loss)
 
180

 
(1,374
)
 
(1,194
)
Net prior-period other comprehensive income/(loss)
 
171

 
(537
)
 
(366
)
As of June 30, 2017
 
$
(5,189
)
 
$
(55
)
 
$
(5,244
)
Reclassifications out of Accumulated Other Comprehensive Income (Loss)
The following table presents amounts reclassified out of accumulated other comprehensive loss for the three and six months ended June 30, 2018 and 2017. Deferred gains or losses for our commodity contracts cash flow hedges are recognized in earnings upon settlement.
 
 
Three Months Ended
 
Six Months Ended
 
 
June 30,
 
June 30,
 
 
2018
 
2017
 
2018
 
2017
(in thousands)
 
 
 
 
 
 
 
 
Amortization of defined benefit pension and postretirement plan items:
 
 
 
 
 
 
 
 
Prior service credit (1)
 
$
19

 
$
20

 
$
39

 
$
39

Net loss(1)
 
(149
)
 
(170
)
 
(297
)
 
(339
)
Total before income taxes
 
(130
)

(150
)
 
(258
)

(300
)
Income tax benefit
 
36

 
61

 
69

 
120

Net of tax
 
$
(94
)
 
$
(89
)
 
$
(189
)

$
(180
)
 
 
 
 
 
 
 
 
 
Gains and losses on commodity contracts cash flow hedges:
 
 
 
 
 
 
 
 
Propane swap agreements (2)
 
$
(181
)
 
$
77

 
$
(645
)
 
$
465

Natural gas swaps (2)
 
(31
)
 
—

 
(481
)
 
—

Natural gas futures (2)
 
(161
)
 
631

 
137

 
1,781

Total before income taxes
 
(373
)
 
708

 
(989
)

2,246

Income tax benefit (expense)
 
105

 
(273
)
 
277

 
(872
)
Net of tax
 
(268
)
 
435


(712
)
 
1,374

Total reclassifications for the period
 
$
(362
)
 
$
346


$
(901
)
 
$
1,194