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Stockholder's Equity - Accumulated Other Comprehensive Income (Loss) (Tables)
 3 Months Ended
Mar. 31, 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 (loss)/income before reclassifications
 
(9
)
 
1,278

 
1,269

Amounts reclassified from accumulated other comprehensive loss
 
91

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

 
338

 
420

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

 
$
(4,458
)

 
 
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 loss before reclassifications
 
—

 
(283
)
 
(283
)
Amounts reclassified from accumulated other comprehensive loss
 
89

 
283

 
372

Net prior-period other comprehensive income
 
89

 
—

 
89

As of March 31, 2016
 
$
(5,491
)
 
$
(260
)
 
$
(5,751
)
Reclassifications out of Accumulated Other Comprehensive Income (Loss)
 
 
Three Months Ended
 
 
March 31,
 
 
2017
 
2016
(in thousands)
 
 
 
 
Amortization of defined benefit pension and postretirement plan items:
 
 
 
 
Prior service credit (1)
 
$
19

 
$
20

Net loss(1)
 
(170
)
 
(168
)
Total before income taxes
 
(151
)

(148
)
Income tax benefit
 
60

 
59

Net of tax
 
$
(91
)
 
$
(89
)
 
 
 
 
 
Gains and losses on commodity contracts cash flow hedges
 
 
 
 
Propane swap agreements (2)
 
$
388

 
$
(322
)
Natural gas futures (2)
 
1,150

 
(149
)
Total before income taxes
 
1,538

 
(471
)
Income tax (expense) benefit
 
(598
)
 
188

Net of tax
 
940

 
(283
)
Total reclassifications for the period
 
$
849

 
$
(372
)