Nature of Operations and Summary of Significant Accounting Policies--Average Prices (Details)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Oil
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]
Price before field differentials used in determining future net revenues	96.78
Natural Gas
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]
Price before field differentials used in determining future net revenues	3.67		2.76		4.11
Natural Gas Liquids
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]
Price before field differentials used in determining future net revenues	32.53	[1]	0.00	[1]	0.00	[1]

[1] The NGL price is provided only for 2013 to coincide with our separate presentation of NGL reserves in that year.