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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2015
Equity [Abstract]  
Changes in accumulated other comprehensive income (loss) by component, net of tax
Changes in accumulated other comprehensive income (loss) by component, net of tax, were as follows:

(In thousands)
Net Gains
(Losses) on
Cash Flow
Hedges
 
Postretirement
Benefits
 
Total
Balance at December 31, 2012
$
30,717

 
$
(6,837
)
 
$
23,880

Other comprehensive income (loss) before reclassifications
(2,720
)
 
4,641

 
1,921

Amounts reclassified from accumulated other comprehensive income (loss)
(34,548
)
 
386

 
(34,162
)
Net current-period other comprehensive income (loss)
$
(37,268
)
 
$
5,027

 
$
(32,241
)
Balance at December 31, 2013
$
(6,551
)
 
$
(1,810
)
 
$
(8,361
)
Other comprehensive income (loss) before reclassifications
(80,175
)
 
(325
)
 
(80,500
)
Amounts reclassified from accumulated other comprehensive income (loss)
86,726

 
(16
)
 
86,710

Net current-period other comprehensive income (loss)
6,551

 
(341
)
 
6,210

Balance at December 31, 2014
$
—

 
$
(2,151
)
 
$
(2,151
)
Other comprehensive income (loss) before reclassifications
—

 
1,786

 
1,786

Amounts reclassified from accumulated other comprehensive income (loss)
—

 
—

 
—

Net current-period other comprehensive income (loss)
—

 
1,786

 
1,786

Balance at December 31, 2015
$
—

 
$
(365
)
 
$
(365
)
Schedule of amount reclassified from accumulated other comprehensive income (loss) into the Condensed Consolidated Statement of Operations
Amounts reclassified from accumulated other comprehensive income (loss) into the Consolidated Statement of Operations were as follows:
 
Year Ended December 31,
 
Affected Line Item in the Condensed
Consolidated Statement of Operations
(In thousands)
2015
 
2014
 
2013
 
Net gains (losses) on cash flow hedges
 

 
 

 
 

 
 
Commodity contracts
$
—

 
$
(143,577
)
 
$
52,733

 
Natural gas revenues
Commodity contracts
—

 
(626
)
 
4,269

 
Crude oil and condensate revenues
Postretirement benefits
 

 
 

 
 

 
 
Amortization of net (gain) loss
—

 
26

 
(641
)
 
General and administrative expense
 
—

 
(144,177
)
 
56,361

 
Total before tax
 
—

 
57,467

 
(22,199
)
 
Tax expense
Total reclassifications for the period
$
—

 
$
(86,710
)
 
$
34,162

 
Net of tax