Property and Equipment (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Amortization costs	$ 29,600,000
Anticipated amount for wells	29,600,000
Exploratory Wells [Member]
Property, Plant and Equipment [Line Items]
Amortization costs	21,500,000
Development Wells [Member]
Property, Plant and Equipment [Line Items]
Amount for development wells	$ 8,100,000
Maximum [Member]
Property, Plant and Equipment [Line Items]
Anticipated Timing of Inclusion of Costs in Amortization Calculation, Years	5 years
Minimum [Member]
Property, Plant and Equipment [Line Items]
Anticipated Timing of Inclusion of Costs in Amortization Calculation, Years	3 years