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Stockholder's Equity - Accumulated Other Comprehensive Income (Loss) (Tables)
 3 Months Ended
Mar. 31, 2018
Equity [Abstract]  
Changes in Accumulated Other Comprehensive Loss
 
 
Defined Benefit
 
Commodity
 
 
 
 
Pension and
 
Contracts
 
 
 
 
Postretirement
 
Cash Flows
 
 
 
 
Plan Items
 
Hedges
 
Total
(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
 
94

 
444

 
538

Net current-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
)


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

 
$
(4,878
)
Other comprehensive income/(loss) before reclassifications
 
(9
)
 
1,278

 
1,269

Amounts reclassified from accumulated other comprehensive income/(loss)
 
91

 
(940
)
 
(849
)
Net prior-period other comprehensive income
 
82

 
338

 
420

As of March 31, 2017
 
$
(5,278
)
 
$
820

 
$
(4,458
)
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, 2018 and 2017. Deferred gains or losses for our commodity contracts cash flows hedges are recognized in earnings upon settlement.
 
 
Three Months Ended
 
 
March 31,
 
 
2018
 
2017
(in thousands)
 
 
 
 
Amortization of defined benefit pension and postretirement plan items:
 
 
 
 
Prior service credit (1)
 
$
19

 
$
19

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

(151
)
Income tax benefit
 
36

 
60

Net of tax
 
$
(94
)
 
$
(91
)
 
 
 
 
 
Gains and losses on commodity contracts cash flow hedges:
 
 
 
 
Propane swap agreements (2)
 
$
(464
)
 
$
388

Natural gas swaps (2)
 
(450
)
 
—

Natural gas futures (2)
 
298

 
1,150

Total before income taxes
 
(616
)
 
1,538

Income tax benefit (expense)
 
172

 
(598
)
Net of tax
 
(444
)
 
940

Total reclassifications for the period
 
$
(538
)
 
$
849