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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
The following tables present the changes in the balance of accumulated other comprehensive loss for the years ended December 31, 2017 and 2016. All amounts in the following tables are presented net of tax.
    
 
 
Defined Benefit Pension and Postretirement Plan Items
 
Commodity Contract Cash Flow Hedges
 
Total
(in thousands)
 
 
 
 
 
 
As of December 31, 2016
 
$
(5,360
)
 
$
482

 
$
(4,878
)
Other comprehensive income before reclassifications
 
281

 
159

 
440

Amounts reclassified from accumulated other comprehensive income/(loss)
 
336

 
(170
)
 
166

Net current-period other comprehensive income/(loss)
 
617

 
(11
)
 
606

As of December 31, 2017
 
$
(4,743
)
 
$
471

 
$
(4,272
)

 
 
 
Defined Benefit Pension and Postretirement Plan Items
 
Commodity Contracts Cash Flow Hedges
 
Total
(in thousands)
 
 
 
 
 
 
As of December 31, 2015
 
$
(5,580
)
 
$
(260
)
 
$
(5,840
)
Other comprehensive income/(loss) before reclassifications
 
(254
)
 
762

 
508

Amounts reclassified from accumulated other comprehensive income/(loss)
 
474

 
(20
)
 
454

Net current-period other comprehensive income
 
220

 
742

 
962

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

 
$
(4,878
)
Reclassification out of Accumulated Other Comprehensive Income
The following table presents amounts reclassified out of accumulated other comprehensive income (loss) for the years ended December 31, 2017, 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)
 
2017
 
2016
 
2015
Amortization of defined benefit pension and postretirement plan items:
 
 
 
 
 
 
 Prior service cost (1)
 
$
77

 
$
77

 
$
68

Net gain (1)
 
(636
)
 
(871
)
 
(650
)
Total before income taxes
 
(559
)
 
(794
)
 
(582
)
       Income tax benefit
 
223

 
320

 
233

Net of tax
 
$
(336
)
 
$
(474
)
 
$
(349
)
 
 
 
 
 
 
 
Gains and losses on commodity contracts cash flow hedges
 
 
 
 
 
 
Propane swap agreements (2)
 
$
1,607

 
$
(322
)
 
$
(120
)
Natural gas swaps (2)
 
(822
)
 
—

 
(55
)
Natural gas futures (2)
 
(456
)
 
345

 
(31
)
Total before income taxes
 
329

 
23

 
(206
)
Income tax impact
 
(159
)
 
(3
)
 
83

Net of tax
 
$
170

 
$
20

 
$
(123
)
 
 
 
 
 
 
 
Total reclassifications for the period
 
$
(166
)
 
$
(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.