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Accumulated Other Comprehensive Income (Loss) (Tables)
 6 Months Ended
Jun. 30, 2014
Equity [Abstract]  
Changes in Accumulated Other Comprehensive Loss
 
 
Defined Benefit
 
Commodity
 
 
 
 
Pension and
 
Contracts
 
 
 
 
Postretirement
 
Cash Flow
 
 
 
 
Plan Items
 
Hedges
 
Total
(in thousands)
 
 
 
 
 
 
December 31, 2012
 
$
(5,062
)
 
$
—

 
$
(5,062
)
Other comprehensive loss before reclassifications
 
(6
)
 
—

 
(6
)
Amounts reclassified from accumulated other comprehensive loss
 
110

 
—

 
110

Net current-period other comprehensive income
 
104

 
—

 
104

June 30, 2013
 
$
(4,958
)
 
$
—

 
$
(4,958
)
 
 
Defined Benefit
 
Commodity
 
 
 
 
Pension and
 
Contracts
 
 
 
 
Postretirement
 
Cash Flow
 
 
 
 
Plan Items
 
Hedges
 
Total
(in thousands)
 
 
 
 
 
 
December 31, 2013
 
$
(2,533
)
 
$
—

 
$
(2,533
)
Other comprehensive loss before reclassifications
 
—

 
(1
)
 
(1
)
Amounts reclassified from accumulated other comprehensive loss
 
61

 
—

 
61

Net current-period other comprehensive income (loss)
 
61

 
(1
)
 
60

June 30, 2014
 
$
(2,472
)
 
$
(1
)
 
$
(2,473
)
Reclassifications out of Accumulated Other Comprehensive Income (Loss)
 
 
Three Months Ended
 
Six Months Ended
 
 
June 30,
 
June 30,
 
 
2014
 
2013
 
2014
 
2013
(in thousands)
 
 
 
 
 
 
 
 
Amortization of defined benefit pension and postretirement plan items:
 
 
 
 
 
 
 
 
Prior service cost (1)
 
$
15

 
$
15

 
$
30

 
$
30

Net loss (1)
 
(67
)
 
(107
)
 
(132
)
 
(213
)
Total before income taxes
 
(52
)

(92
)
 
(102
)
 
(183
)
Income tax benefit
 
21

 
37

 
41

 
73

Net of tax
 
$
(31
)
 
$
(55
)
 
$
(61
)
 
$
(110
)