Acquisitions (Tables)

9 Months Ended

Sep. 30, 2012

Acquisitions [Abstract]

Summary Of Fair Value Of Assets Acquired 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				Nine Months Ended
		(Unaudited)				(Unaudited)
		September 30, 2012		September 30, 2011		September 30, 2012		September 30, 2011
		Actual		Pro Forma		Pro Forma		Pro Forma
Total Revenue	$	64,969	$	72,815	$	205,081	$	221,574
Operating income	$	8,565	$	14,292	$	33,314	$	58,349
Net income (loss)	$	(45,007)	$	107,530	$	51,983	$	97,577
Net income (loss) per unit:
Common unitholders' (basic)	$	(1.25)	$	1.21	$	0.54	$	1.08
Common unitholders' (diluted)	$	(1.25)	$	1.21	$	0.54	$	1.08
Subordinated units (basic)	$	(1.26)	$	1.21	$	0.53	$	1.08
Subordinated units (diluted)	$	(1.26)	$	1.21	$	0.53	$	1.08