Acquisitions (Tables)

6 Months Ended

Jun. 30, 2012

Acquisitions [Abstract]

Summary Of Fair Value Of Assets Aquired And Liabilities Assumed

Oil and gas properties
Evaluated	$	223,740
Unevaluated		9,000
Asset retirement obligation		(4,738)
Environmental liability		(1,891)
Other current liabilities		(993)
Net assets acquired	$	225,118

Proforma Financial Results

		Three Months Ended				Six Months Ended
		(Unaudited)				(Unaudited)
		June 30, 2012		June 30, 2011		June 30, 2012		June 30, 2011
		Pro Forma		Pro Forma		Pro Forma		Pro Forma
Total Revenue	$	64,258	$	77,285	$	140,112	$	148,758
Operating Income	$	6,220	$	23,586	$	24,749	$	44,057
Net income (loss)	$	99,929	$	33,380	$	96,990	$	(9,954)
Net income (loss) per unit:
Common unitholders' (basic)	$	2.16		0.45		2.05		(0.13)
Common unitholders' (diluted)	$	1.68		0.45		1.69		(0.13)
Subordinated units (basic)	$	2.14		0.45		1.88		(0.13)
Subordinated units (diluted)	$	1.67		0.45		1.62		(0.13)