Summary of Significant Accounting Policies (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	May 01, 2013
Accounts Receivable (Textual) [Abstract]
Allowance for doubtful accounts receivable, current	$ 100,000	$ 100,000
Trade Accounts Receivable, Gross	56,900,000	57,200,000
Accounts receivable related to joint interest owners	1,600,000	3,600,000
Severance Tax Receivables	11,600,000	6,400,000
Other Receivables	800,000	4,000,000
Summary of Significant Accounting Policies (Textual) [Abstract]
Total capitalized internal costs	31,800,000	31,100,000	29,300,000
Total capitalized interest cost on unproved properties	7,200,000	7,900,000	7,700,000
Discount rate for estimated future net revenues from proved properties	10.00%
Write-down of oil and gas properties	46,948,000	0	0
Gain (loss) on Price Risk Derivatives, Net	(900,000)	2,300,000	(900,000)
Unrealized Gain (Loss) on Derivatives	(100,000)
Derivative Asset, Fair Value, Gross Asset	800,000
Derivative Liability, Fair Value, Gross Liability	900,000
Derivative, Fair Value, Net	(100,000)
Receivables, Fair Value Disclosure	100,000
Liabilities, Fair Value Disclosure	200,000
Percentage of working interest in wells	100.00%
Total amount of supervision fees charged to wells	11,600,000	11,300,000	12,900,000
Inventories carried at cost	3,500,000	5,600,000
Inventory Write-down		2,100,000
Outstanding checks included in trade accounts payable	26,100,000	13,300,000
Restricted cash and cash equivalents included in other long term assets	1,000,000	1,000,000
Reduction of asset retirement obligation due to sale of properties				11,300,000
Asset Retirement Obligation - current portion	15,859,000	7,134,000
Senior Notes Due Two Thousand Seventeen [Member]
Debt Issuance Costs (Textual) [Abstract]
Stated Rate of Senior notes	7.125%
Balance of issuance costs for credit facility	1,800,000
Senior Notes Due Two Thousand Twenty [Member]
Debt Issuance Costs (Textual) [Abstract]
Stated Rate of Senior notes	8.875%
Balance of issuance costs for credit facility	3,600,000
Senior Notes due 2022 [Member]
Debt Issuance Costs (Textual) [Abstract]
Stated Rate of Senior notes	7.875%
Balance of issuance costs for credit facility	6,500,000
Line of Credit [Member]
Debt Issuance Costs (Textual) [Abstract]
Balance of issuance costs for credit facility	$ 3,300,000
Maximum [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Property, Plant and Equipment, Useful Life		20 years
Minimum [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Property, Plant and Equipment, Useful Life	2 years
Shell Oil Company Concentration Risk [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Concentration Risk, Percentage	33.00%	46.00%	49.00%
BP America Concentration Risk [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Concentration Risk, Percentage	21.00%
Southcross Energy Concentration Risk [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Concentration Risk, Percentage		11.00%