Fair Value Measurement (Tables)

12 Months Ended

Dec. 31, 2011

Notes to Financial Statements [Abstract]

ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock

		Fair Value		Fair Value Measurements at December 31, 2011
		as of		Using Fair Value Hierarchy
		December 31, 2011		Level 1		Level 2		Level 3
		(In thousands)
Assets:
	Commodity derivatives	$	4,128	$	-	$	4,128	$	-
	Long-term investments		962		962		-		-
	Total	$	5,090	$	962	$	4,128	$	-
Liabilities:
	Commodity derivatives	$	44,302	$	-	$	44,302	$	-
	Interest-rate swap derivatives		79,725		-		79,725		-
	Total	$	124,027	$	-	$	124,027	$	-
		Fair Value		Fair Value Measurements at December 31, 2010
		as of		Using Fair Value Hierarchy
		December 31, 2010		Level 1		Level 2		Level 3
		(In thousands)
Assets:
	Commodity derivatives	$	133	$	-	$	133	$	-
	Long-term investments		937		937		-		-
	Total	$	1,070	$	937	$	133	$	-
Liabilities:
	Commodity derivatives	$	50,033	$	-	$	50,033	$	-
	Interest-rate swap derivatives		24,346		-		24,346		-
	Total	$	74,379	$	-	$	74,379	$	-