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Accumulated Other Comprehensive Income (Tables)
 3 Months Ended
Mar. 31, 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 March 31 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 before reclassification
(9,911
)
 
(1,736
)
Amounts reclassified from accumulated other comprehensive income
(1,514
)
 
(3,787
)
New current-period other comprehensive income
(11,425
)
 
(5,523
)
Balance at March 31:
$
(3,838
)
 
$
13,503
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 March 31 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
$
3,831

 
$
8,176

 
Oil and natural gas revenues
Commodity derivatives
(1,349
)
 
(1,993
)
 
Loss on derivatives not designated as hedges and hedge ineffectiveness, net
 
2,482

 
6,183

 
Total before tax
 
(968
)
 
(2,396
)
 
Tax expense
Total reclassification for the period
$
1,514

 
3,787

 
Net of tax