Acquisitions (Fleetwood Joint Venture) (Details) (Fleetwood Joint Venture, Louisiana, USD $) In Millions, unless otherwise specified	1 Months Ended
	Jul. 31, 2014	Jun. 30, 2014 sqmi acre
Fleetwood Joint Venture | Louisiana
Business Acquisition [Line Items]
Purchase price		$ 24
Average working interest in leasehold position		37.00%
Acres acquired in leasehold position		30,000
Square miles of proprietary 3D survey		200
Cash portion of acquisition	3.0	10.0
Cash payment in January 2015		7
Cash funding for future drilling		$ 14