Quarterly Financial Data (Tables)

12 Months Ended

Dec. 31, 2012

Quarterly Financial Information Disclosure [Abstract]

Schedule Of Quarterly Financial Information [Table Text Block]

			First Quarter		Second Quarter		Third Quarter		Fourth Quarter
			2012 (1) (3)
Revenues		$	15,166	$	23,003	$	83,275	$	97,615
Operating expenses			33,867		41,359		64,174		59,857
Operating profit (loss)			(18,701)		(18,356)		19,101		37,758
Net loss to common stockholders			(35,718)		(51,264)		(34,158)		(6,910)
Net loss per common share - basic and diluted			(0.94)		(1.31)		(0.73)		(0.15)
			2011 (2)
Revenues		$	14,104	$	19,053	$	10,302	$	16,632
Operating expenses			16,077		18,304		42,524		50,800
Operating profit (loss)			(1,973)		749		(32,222)		(34,168)
Net loss to common stockholders			(8,002)		(16,110)		(63,756)		(45,101)
Net loss per common share - basic and diluted			(0.30)		(0.42)		(1.63)		(1.15)
(1)	Includes impairments of oil and gas properties of $15.7 million, $20.0 million, $11.4 million,
	and $6.0 million for the first, second, third and fourth quarters of 2012, respectively.
(2)	Includes impairments of oil and gas properties of $28.8 million and $36.9 million, for the third
	and fourth quarters of 2011, respectively.
(3)	Includes $7.0 million in the fourth quarter of 2012 related to the correction of an error in deferred income taxes
	in prior periods that was not material to the current year operations.