Acquisitions (2012 East Texas Acquisition) (Narrative) (Details) (2012 East Texas Properties [Member], USD $) In Millions, unless otherwise specified	0 Months Ended	12 Months Ended
	Dec. 04, 2012 MMBoe	Dec. 31, 2013	Dec. 31, 2012
2012 East Texas Properties [Member]
Business Acquisition [Line Items]
Date of acquisition		Dec. 04, 2012
Aggregate purchase price	$ 214.3
Effective date of acquisition		Nov. 01, 2012
Proved developed reserves	10.8
Cost associated with acquisition recorded in acquisition and transaction costs			$ 0.3