Property and Equipment (Details Textuals) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]
Cost Incurred On Proved Reserves Transferred To Amortization Base	$ 417.6
Minimum [Member]
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]
Anticipated Timing of Inclusion of Costs in Amortization Calculation	5 years
Maximum [Member]
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]
Anticipated Timing of Inclusion of Costs in Amortization Calculation	10 years