Basis of Presentation (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 439,000	$ 474,000	$ 474,000
Entity's asset retirement obligation transactions [Roll Forward]
Beginning asset retirement obligation	9,888,000	11,381,000	11,381,000
New wells placed on production and other	125,000		222,000
Deletions related to property disposals and plugging costs	(229,000)		(2,491,000)
Accretion expense	144,000	172,000	638,000
Revisions	(82,000)		138,000
Ending asset retirement obligation	9,846,000		9,888,000
Working Capital (Deficit) [Abstract]
Current liabilities	64,664,000		82,735,000
Current assets	27,894,000		39,549,000
Accounts receivable	26,798,000		33,615,000
Cash and cash equivalents	349,000	154,000	5,205,000	2,061,000
Trade payables, current	40,904,000		52,793,000
Revenues due third parties	16,961,000		23,810,000
Derivative liabilities, current	2,860,000		2,728,000
Current maturities of long-term debt	2,158,000		2,142,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	306,000	362,000
Number of Shares [Abstract]
Outstanding, beginning (in shares)	5,400
Granted (in shares)	923
Exercised (in shares)	(59)
Canceled (in shares)	(29)
Outstanding, ending (in shares)	6,235
Weighted Average Option Exercise Price Per Share [Abstract]
Outstanding, beginning (in dollars per share)	$ 2.77
Granted (in dollars per share)	$ 3.15
Exercised (in dollars per share)	$ 2.07
Canceled (in dollars per share)	$ 3.23
Outstanding, ending (in dollars per share)	$ 2.83
Weighted Average Grant Date Fair Value Per Share [Abstract]
Outstanding, beginning (in dollars per share)	$ 1.98
Granted (in dollars per share)	$ 2.28
Exercised (in dollars per share)	$ 1.31
Canceled (in dollars per share)	$ 2.30
Outstanding, ending (in dollars per share)	$ 1.99
Options exercisable (in shares)	4,112		3,828
Unamortized compensation expense	2,100,000
Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	133,000	112,000
Weighted Average Grant Date Fair Value Per Share [Abstract]
Unamortized compensation expense	$ 2,600,000
Number of Shares [Abstract]
Unvested, beginning (in shares)	355
Granted (in shares)	741
Vested/Released (in shares)	0
Forfeited (in shares)	(8)
Unvested, ending (in shares)	1,088
Weighted Average Grant Date Fair value Per Share [Abstract]
Unvested, beginning (in dollars per share)	$ 3.24
Granted (in dollars per share)	$ 3.15
Vested/Released (in dollars per share)	$ 4.88
Forfeited (in dollars per share)	$ 3.44
Unvested, ending (in dollars per share)	$ 3.18