Basis of Presentation (Details) (USD $)	0 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 24, 2014	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Jun. 24, 2014	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		$ 1,029,000	$ 669,000	$ 1,468,000	$ 1,142,000
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				151,000		222,000
Deletions related to property disposals and plugging costs				(437,000)		(2,491,000)
Accretion expense				290,000	335,000	638,000
Revisions				(145,000)		138,000
Ending asset retirement obligation		9,747,000		9,747,000		9,888,000
Stock Issued During Period, Shares, New Issues	11,500,000
Shares Issued, Price Per Share							$ 5.00
Proceeds from Issuance of Common Stock	54,000,000			53,958,000	0
Working Capital (Deficit) [Abstract]
Current liabilities		76,196,000		76,196,000		82,735,000
Current assets		33,068,000		33,068,000		39,549,000
Accounts receivable		28,851,000		28,851,000		33,615,000
Cash and cash equivalents		3,742,000	2,432,000	3,742,000	2,432,000	5,205,000		2,061,000
Trade payables, current		49,003,000		49,003,000		52,793,000
Revenues due third parties		16,509,000		16,509,000		23,810,000
Derivative liabilities, current		6,318,000		6,318,000		2,728,000
Current maturities of long-term debt		2,181,000		2,181,000		2,142,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		807,000	558,000	1,114,000	920,000
Number of Shares [Abstract]
Outstanding, beginning (in shares)				5,400,000
Granted (in shares)				1,020,000
Exercised (in shares)				(351,000)
Canceled (in shares)				(67,000)
Outstanding, ending (in shares)		6,002,000		6,002,000
Weighted Average Option Exercise Price Per Share [Abstract]
Outstanding, beginning (in dollars per share)				$ 2.77
Granted (in dollars per share)				$ 3.36
Exercised (in dollars per share)				$ 2.69
Canceled (in dollars per share)				$ 2.97
Outstanding, ending (in dollars per share)		$ 2.87		$ 2.87
Weighted Average Grant Date Fair Value Per Share [Abstract]
Outstanding, beginning (in dollars per share)				$ 1.98
Granted (in dollars per share)				$ 2.43
Exercised (in dollars per share)				$ 1.86
Canceled (in dollars per share)				$ 2.11
Outstanding, ending (in dollars per share)		$ 2.06		$ 2.06
Options exercisable (in shares)		4,069,000		4,069,000		3,828,000
Unamortized compensation expense		3,300,000		3,300,000
Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		222,000	111,000	354,000	222,000
Weighted Average Grant Date Fair Value Per Share [Abstract]
Unamortized compensation expense		2,500,000		2,500,000
Number of Shares [Abstract]
Unvested, beginning (in shares)				355,000
Granted (in shares)				762,000
Vested/Released (in shares)				(5,000)
Forfeited (in shares)				(20,000)
Unvested, ending (in shares)		1,092,000		1,092,000
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)				$ 2.94
Forfeited (in dollars per share)				$ 3.47
Unvested, ending (in dollars per share)		$ 3.18		$ 3.18
Canada
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unamortized Costs Capitalized Less Related Deferred Income Taxes Exceed Ceiling Limitations, Expense					$ 2,000,000