Acquisitions and Dispositions Acquisitions and Dispositions (Details) (USD $)	Sep. 30, 2014		Jul. 15, 2014 acre	Dec. 31, 2013
Business Combinations [Abstract]
Acreage Sold in Oil and Gas Properties			8,300
Participation Interest Sold in Oil and Gas Properties			36.00%
Significant Acquisitions and Disposals, Acquisition Costs or Sale Proceeds			$ 175,000,000
Cash Received at Closing from Oil and Gas Properties			125,000,000
Remaining Cash Carry of Field Development Costs	35,000,000
Cash Carry of Field Development Costs			50,000,000
Sale Proceeds Received at Closing			147,000,000
Deferred Credits and Other Liabilities, Current	$ 22,685,000	[1]	$ 12,500,000	$ 0	[1]

[1] This amount equals the liability related to funds received from Saka Energi that are maintained in a restricted cash account. Refer to the "Short-Term Restricted Cash" discussion below for further information.