Oil and Gas Properties (Income (Loss) From Discontinued Operations) (Details) (USD $)	3 Months Ended			12 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income from discontinued operations, net of tax	$ 44,000	$ (29,000)	$ 1,058,000	$ 1,073,000	$ 23,684,000
Oil and gas property impairments					138,600,000
Energy Resource Technology GOM, Inc [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues				48,847,000	557,231,000
Production (lifting) costs				16,017,000	164,663,000
Hurricane repair expense					662,000
Exploration expense				3,514,000	3,295,000
Depreciation, depletion, amortization and accretion				1,226,000	158,284,000
Proved property impairment and abandonment				(152,000)	151,045,000
Loss on sale of oil and gas properties					1,714,000
Hedge ineffectiveness and non-hedge gain on commodity derivative contracts					(5,550,000)
Selling, general and administrative expense				1,229,000	17,823,000
Net interest expense and other				2,732,000	28,191,000
Total costs				24,566,000	520,127,000
Pretax income from discontinued operations				24,281,000	37,104,000
Income tax provision				8,499,000	13,420,000
Income from operations of discontinued operations				15,782,000	23,684,000
Loss on sale of business, net of tax				(14,709,000)
Income from discontinued operations, net of tax				1,073,000	23,684,000
Net interest expense				$ 2,700,000	$ 27,700,000