Accumulated Other Comprehensive Income (Tables)

12 Months Ended

Dec. 31, 2014

Equity [Abstract]

Changes in accumulated other comprehensive income [Table Text Block]

Changes in accumulated other comprehensive income (loss) by component, net of tax, are as follows:

	Net Gains (Losses) on Cash Flow Hedges
	2014		2013			2012
	(In thousands)
Balance at January 1:	$	—	$	7,587		$	19,026
Other comprehensive income before reclassification	—		(7,349		)	18,635
Amounts reclassified from accumulated other comprehensive income	—		(238		)	(30,074		)
New current-period other comprehensive income	—		(7,587		)	(11,439		)
Balance at December 31:	$	—	$	—		$	7,587

Schedule of accumulated other comprehensive income [Table Text Block]

Amounts reclassified from accumulated other comprehensive income (loss) into the Consolidated Statements of Income for the year ended December 31:

	2014		2013			2012			Affected Line Item in the Statement Where Net Income is Presented
	(In thousands)
Net gains (loss) on cash flow hedges
Commodity derivatives	$	—	$	603		$	51,853		Oil and natural gas revenues
Commodity derivatives	—		(190		)	(2,616		)	Gain (loss) on derivatives not designated as hedges and hedge ineffectiveness, net
	—		413			49,237			Total before tax
	—		(175		)	(19,163		)	Tax expense
Total reclassification for the period	$	—	$	238		$	30,074		Net of tax