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Stockholder's Equity - Accumulated Other Comprehensive Income (Loss) (Tables)
 9 Months Ended
Sep. 30, 2017
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, 2016
 
$
(5,360
)
 
$
482

 
$
(4,878
)
Other comprehensive income/(loss) before reclassifications
 
(9
)
 
322

 
313

Amounts reclassified from accumulated other comprehensive income/(loss)
 
271

 
(965
)
 
(694
)
Net current-period other comprehensive income/(loss)
 
262

 
(643
)
 
(381
)
As of September 30, 2017
 
$
(5,098
)
 
$
(161
)
 
$
(5,259
)

 
 
Defined Benefit
 
Commodity
 
 
 
 
Pension and
 
Contracts
 
 
 
 
Postretirement
 
Cash Flow
 
 
 
 
Plan Items
 
Hedges
 
Total
(in thousands)
 
 
 
 
 
 
As of December 31, 2015
 
$
(5,580
)
 
$
(260
)
 
$
(5,840
)
Other comprehensive income before reclassifications
 
—

 
641

 
641

Amounts reclassified from accumulated other comprehensive income/(loss)
 
263

 
(93
)
 
170

Net prior-period other comprehensive income
 
263

 
548

 
811

As of September 30, 2016
 
$
(5,317
)
 
$
288

 
$
(5,029
)
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, 2017 and 2016. 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,
 
 
2017
 
2016
 
2017
 
2016
(in thousands)
 
 
 
 
 
 
 
 
Amortization of defined benefit pension and postretirement plan items:
 
 
 
 
 
 
 
 
Prior service credit (1)
 
$
19

 
$
20

 
$
58

 
$
60

Net loss(1)
 
(171
)
 
(166
)
 
(509
)
 
(500
)
Total before income taxes
 
(152
)

(146
)
 
(451
)

(440
)
Income tax benefit
 
61

 
58

 
180

 
177

Net of tax
 
$
(91
)
 
$
(88
)
 
$
(271
)

$
(263
)
 
 
 
 
 
 
 
 
 
Gains and losses on commodity contracts cash flow hedges
 
 
 
 
 
 
 
 
Propane swap agreements (2)
 
$
198

 
$
—

 
$
663

 
$
(322
)
Natural gas swaps (2)
 
1

 
—

 
1

 
—

Natural gas futures (2)
 
(852
)
 
105

 
929

 
464

Total before income taxes
 
(653
)
 
105

 
1,593


142

Income tax benefit (expense)
 
248

 
(41
)
 
(628
)
 
(49
)
Net of tax
 
(405
)
 
64


965

 
93

Total reclassifications for the period
 
$
(496
)
 
$
(24
)

$
694

 
$
(170
)