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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2015
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, 2015 and 2014. All amounts in the following table are presented net of tax.
 
 
 
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 gain/(loss)
 
63

 
(227
)
 
(164
)
As of December 31, 2015
 
$
(5,580
)
 
$
(260
)
 
$
(5,840
)

 
 
 
Defined Benefit Pension and Postretirement Plan Items
 
Commodity Contracts Cash Flow Hedges
 
Total
(in thousands)
 
 
 
 
 
 
As of December 31, 2013
 
$
(2,533
)
 
$
—

 
$
(2,533
)
Other comprehensive loss before reclassifications
 
(3,242
)
 
(482
)
 
(3,724
)
Amounts reclassified from accumulated other comprehensive loss
 
132

 
449

 
581

Net current-period other comprehensive loss
 
(3,110
)
 
(33
)
 
(3,143
)
As of December 31, 2014
 
$
(5,643
)
 
$
(33
)
 
$
(5,676
)
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, 2015 and 2014. Deferred gains and losses of our commodity contracts cash flow hedges are recognized in earnings upon settlement.
For the Year Ended December 31,
2015
 
2014
(in thousands)
 
 
 
Amortization of defined benefit pension and postretirement plan items:
 
 
 
 Prior service cost (1)
$
68

 
$
58

Net gain (1)
(650
)
 
(279
)
Total before income taxes
(582
)
 
(221
)
Income tax benefit
233

 
89

Net of tax
$
(349
)
 
$
(132
)
 
 
 
 
Gains and losses on commodity contracts cash flow hedges
 
 
 
Propane swap agreements (2)
$
(120
)
 
$
(735
)
Call options (2)
(55
)
 
(17
)
Natural gas futures (2)
(31
)
 
—

Total before income taxes
(206
)
 
(752
)
Income tax benefit
83

 
303

Net of tax
$
(123
)
 
$
(449
)
 
 
 
 
Total reclassifications for the period
$
(472
)
 
$
(581
)
 
(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.