Commitments And Contingencies (Details) (USD $)	3 Months Ended	12 Months Ended			3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Property Reclamation Deposit [Member]	Dec. 31, 2013 Property Reclamation Deposit [Member]	Mar. 31, 2014 2006 Gulf Coast Acquisition [Member]	Aug. 06, 2013 2013 East Texas Properties [Member]	Mar. 31, 2014 2013 East Texas Acquisition And Prize Acquisition [Member]	Dec. 31, 2013 2013 East Texas Acquisition And Prize Acquisition [Member]
Commitments And Contingencies [Line Items]
Other assets	$ 40,292,000	$ 44,752,000	$ 10,700,000	$ 10,700,000
Period of time escrow in effect after abandonment and remediation obligations					3 years
Maximum date escrow will be returned					December 31, 2026
Issued letter of credit in addition to escrow	100,000				23,400,000
Share of excess historical production costs of NPI obligation	1,300,000	2,900,000
Deposit for future development and abandonment costs	18,000,000
Environmental liability						500,000	2,200,000	2,300,000
Operating lease commitment	$ 26,800,000
Lease expiration date	Dec. 31, 2022