Fair-Value Measurements (Tables)

3 Months Ended

Mar. 31, 2012

Fair-Value Measurements [Abstract]

Placement Of Assets And Liabilities Within The Fair Value Hierarchy Levels

	Fair Value at March 31, 2012							Fair Value at December 31, 2011
Recurring Fair Value Measures	Level 1			Level 2		Level 3		Level 1			Level 2		Level 3
Commodity derivatives:
Assets	$	425		$	—	$	—	$	306		$	—	$	—
Liabilities	$	(947	)	$	—	$	—	$	(2,820	)	$	—	$	—