Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Summary of Significant Accounting Policies (Textual) [Abstract]
Total capitalized internal costs	$ 3,300	$ 6,900	$ 7,000	$ 14,100
Discount rate for estimated future net revenues from proved properties			10.00%
Write-down of oil and gas properties	260,504	0	$ 763,073	0
Allowance for doubtful accounts receivable, current	100		100		$ 100
Trade Accounts Receivable, Gross	27,200		27,200		34,800
Accounts receivable related to joint interest owners	7,500		7,500		8,400
Severance Tax Receivable	3,200		3,200		3,100
Other Receivables	1,600		$ 1,600		2,200
Percentage of working interest in wells			100.00%
Total amount of supervision fees charged to wells	2,200	$ 3,000	$ 4,900	$ 5,700
Inventories carried at cost	800		800		3,100
Inventory Write-Down	2,100
Prepaid Expense	4,100		4,100		3,900
Outstanding checks included in trade accounts payable	1,600		1,600		13,700
Restricted cash and cash equivalents included in other long term assets	$ 1,000		1,000		$ 1,000
Treasury Stock Reissued at Lower than Repurchase Price			$ 4,900
Minimum [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Property, Plant and Equipment, Useful Life			2 years
Maximum [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Property, Plant and Equipment, Useful Life			20 years