Discontinued Operations Discontinued Operations (Statements of Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
OIL AND GAS REVENUES	$ 0	$ 0	$ 0	$ 0
General and administrative	408	56	709	68
Accretion related to asset retirement obligations	0	104	36	258
TOTAL COST AND EXPENSES	408	160	745	326
OPERATING LOSS	(408)	(160)	(745)	(326)
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax	0	0	37,294	0
Discontinued Operations, Changes in Estimated Future Obligations	(1,187)	0	1,378	0
Gain (loss) on derivative instruments, net	(18)	(135)	(93)	(543)
Interest expense	0	(871)	(253)	(2,669)
Capitalized interest	0	871	253	2,669
Other income (expense), net	106	4	438	(590)
INCOME (LOSS) BEFORE INCOME TAXES	(1,507)	(291)	38,272	(1,459)
INCOME TAX (EXPENSE) BENEFIT	316	1,306	(14,673)	4,042
NET INCOME (LOSS) FROM DISCONTINUED OPERATIONS, NET OF INCOME TAXES	$ (1,191)	$ 1,015	$ 23,599	$ 2,583