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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2016
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
The following table presents the changes in the balance of accumulated other comprehensive loss for the years ended December 31, 2016 and 2015. All amounts in the following table are presented net of tax.
 
 
Defined Benefit Pension and Postretirement Plan Items
 
Commodity Contract Cash Flow Hedges
 
Total
(in thousands)
 
 
 
 
 
 
As of December 31, 2015
 
$
(5,580
)
 
$
(260
)
 
$
(5,840
)
Other comprehensive (loss)/income before reclassifications
 
(254
)
 
762

 
508

Amounts reclassified from accumulated other comprehensive loss
 
474

 
(20
)
 
454

Net current-period other comprehensive income
 
220

 
742

 
962

As of December 31, 2016
 
$
(5,360
)
 
$
482

 
$
(4,878
)

 
 
 
Defined Benefit Pension and Postretirement Plan Items
 
Commodity Contracts Cash Flow Hedges
 
Total
(in thousands)
 
 
 
 
 
 
As of December 31, 2014
 
$
(5,643
)
 
$
(33
)
 
$
(5,676
)
Other comprehensive loss before reclassifications
 
(286
)
 
(350
)
 
(636
)
Amounts reclassified from accumulated other comprehensive loss
 
349

 
123

 
472

Net current-period other comprehensive income/(loss)
 
63

 
(227
)
 
(164
)
As of December 31, 2015
 
$
(5,580
)
 
$
(260
)
 
$
(5,840
)
Reclassification out of Accumulated Other Comprehensive Income
The following table presents amounts reclassified out of accumulated other comprehensive loss for the years ended December 31, 2016 and 2015. Deferred gains and losses of our commodity contracts cash flow hedges are recognized in earnings upon settlement.
 
 
For the Year Ended December 31,
(in thousands)
 
2016
 
2015
Amortization of defined benefit pension and postretirement plan items:
 
 
 
 
 Prior service cost (1)
 
$
77

 
$
68

Net gain (1)
 
(871
)
 
(650
)
Total before income taxes
 
(794
)
 
(582
)
       Income tax benefit
 
320

 
233

Net of tax
 
$
(474
)
 
$
(349
)
 
 
 
 
 
Gains and losses on commodity contracts cash flow hedges
 
 
 
 
Propane swap agreements (2)
 
$
(322
)
 
$
(120
)
Call options (2)
 
—

 
(55
)
Natural gas futures (2)
 
345

 
(31
)
Total before income taxes
 
23

 
(206
)
Income tax impact
 
(3
)
 
83

Net of tax
 
$
20

 
$
(123
)
 
 
 
 
 
Total reclassifications for the period
 
$
(454
)
 
$
(472
)
 
(1)
These amounts are included in the computation of net periodic benefits. See Note 16, Employee Benefit Plans, for additional details.
(2) 
These amounts are included in the effects of gains and losses from derivative instruments. See Note 7, Derivative Instruments, for additional details.