Organization and Summary of Significant Accounting Policies - PPE (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Allowance for doubtful accounts	100,000	$ 0
Other current assets	5,566,000	8,132,000
Deferred finance costs	5,500,000	7,400,000
Gas gathering system
Property, Plant and Equipment [Line Items]
Useful life (in years)	14 years
Well equipment | Minimum
Property, Plant and Equipment [Line Items]
Useful life (in years)	3 years
Well equipment | Maximum
Property, Plant and Equipment [Line Items]
Useful life (in years)	8 years
Oklahoma
Property, Plant and Equipment [Line Items]
Other current assets	900,000	$ 3,100,000
Oklahoma | Building
Property, Plant and Equipment [Line Items]
Useful life (in years)	39 years