Discontinued Operations Discontinued Operations (Statements of Operations) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
OIL AND GAS REVENUES	$ 0	$ 0	$ 0
Impairment of oil and gas properties	0	0	2,731
General and administrative	62	242	0
Accretion related to asset retirement obligations	363	76	0
TOTAL COST AND EXPENSES	425	318	2,731
OPERATING LOSS	(425)	(318)	(2,731)
Gain (loss) on derivative instruments, net	258	(1,432)	0
Interest expense	3,556	1,805	0
Capitalized interest	3,556	0	0
Other income (expense), net	(591)	259	0
LOSS BEFORE INCOME TAXES	(758)	(3,296)	(2,731)
DEFERRED INCOME TAX BENEFIT	5,068	7,391	956
NET INCOME (LOSS) FROM DISCONTINUED OPERATIONS, NET OF INCOME TAXES	$ 4,310	$ 4,095	$ (1,775)