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Accumulated Other Comprehensive Income (Loss) (Tables)
 9 Months Ended
Sep. 30, 2013
Statement of Other Comprehensive Income [Abstract]  
Changes in accumulated other comprehensive income (loss)
Changes in accumulated other comprehensive income (loss) by component, net of tax, for the three months ended September 30 are as follows:
 
Net Gains (Losses) on Cash Flow Hedges
 
2013
 
2012
 
(In thousands)
Balance at July 1:
$
1,709

 
$
30,314

Other comprehensive income (loss) before reclassification
(4,797
)
 
(14,137
)
Amounts reclassified from accumulated other comprehensive income (loss)
2,125

 
(6,265
)
New current-period other comprehensive income (loss)
(2,672
)
 
(20,402
)
Balance at September 30:
$
(963
)
 
$
9,912

Changes in accumulated other comprehensive income (loss) by component, net of tax, for the nine months ended September 30 are as follows:
 
Net Gains (Losses) on Cash Flow Hedges
 
2013
 
2012
 
(In thousands)
Balance at January 1:
$
7,587

 
$
19,026

Other comprehensive income (loss) before reclassification
(8,617
)
 
11,353

Amounts reclassified from accumulated other comprehensive income (loss)
67

 
(20,467
)
New current-period other comprehensive income (loss)
(8,550
)
 
(9,114
)
Balance at September 30:
$
(963
)
 
$
9,912
Schedule of Accumulated Other Comprehensive Income (Loss)
Amounts reclassified from accumulated other comprehensive income (loss) into the Unaudited Condensed Consolidated Statements of Income for the three months ended September 30 are as follows:
 
2013
 
2012
 
Affected Line Item in the Statement Where Net Income is Presented
 
(In thousands)
 
 
Net gains (loss) on cash flow hedges
 
 
 
 
 
Commodity derivatives
$
(3,210
)
 
$
14,243

 
Oil and natural gas revenues
Commodity derivatives
(252
)
 
(4,015
)
 
Loss on derivatives not designated as hedges and hedge ineffectiveness, net
 
(3,462
)
 
10,228

 
Total before tax
 
1,337

 
(3,963
)
 
Tax expense (benefit)
Total reclassification for the period
$
(2,125
)
 
$
6,265

 
Net of tax
Amounts reclassified from accumulated other comprehensive income (loss) into the Unaudited Condensed Consolidated Statements of Income for the nine months ended September 30 are as follows:
 
2013
 
2012
 
Affected Line Item in the Statement Where Net Income is Presented
 
(In thousands)
 
 
Net gains (loss) on cash flow hedges
 
 
 
 
 
Commodity derivatives
$
(202
)
 
$
38,088

 
Oil and natural gas revenues
Commodity derivatives
116

 
(4,621
)
 
Loss on derivatives not designated as hedges and hedge ineffectiveness, net
 
(86
)
 
33,467

 
Total before tax
 
19

 
(13,000
)
 
Tax expense (benefit)
Total reclassification for the period
$
(67
)
 
$
20,467

 
Net of tax