Derivative Financial Instruments (Oil Derivative Contracts Volume And Weighted Average Price) (Details)	12 Months Ended
	Dec. 31, 2013 Rollfactor Swap Contracts [Member]	Dec. 31, 2013 Oil contracts, price per bbl [Member] Swap Contracts for Next Twelve Months [Member]	Dec. 31, 2013 Oil contracts, price per bbl [Member] Swap Contracts for Year 2 [Member]	Dec. 31, 2013 Oil contracts, price per bbl [Member] Swap Contracts for Year 3 [Member]	Dec. 31, 2013 Oil contracts, price per bbl [Member] Collar Contracts With Short Puts for Next Twelve Months [Member]	Dec. 31, 2013 Oil contracts, price per bbl [Member] Collar Contracts With Short Puts for Next Twelve Months [Member] Short Put [Member]	Dec. 31, 2013 Oil contracts, price per bbl [Member] Collar Contracts With Short Puts for Year 2 [Member]	Dec. 31, 2013 Oil contracts, price per bbl [Member] Collar Contracts With Short Puts for Year 2 [Member] Short Put [Member]	Dec. 31, 2013 Oil contracts, price per bbl [Member] Collar Contracts With Short Puts for Year 3 [Member]	Dec. 31, 2013 Oil contracts, price per bbl [Member] Collar Contracts With Short Puts for Year 3 [Member] Short Put [Member]	Feb. 20, 2014 Oil contracts, price per bbl [Member] Rollfactor Swap Contracts for March Through December 2014 [Member]	Feb. 20, 2014 Oil contracts, price per bbl [Member] Rollfactor Swap Contracts for Year 2 [Member]	Dec. 31, 2013 Oil contracts [Member] Swap Contracts for Next Twelve Months [Member]	Dec. 31, 2013 Oil contracts [Member] Swap Contracts for Year 2 [Member]	Dec. 31, 2013 Oil contracts [Member] Swap Contracts for Year 3 [Member]	Dec. 31, 2013 Oil contracts [Member] Collar Contracts With Short Puts for Next Twelve Months [Member]	Dec. 31, 2013 Oil contracts [Member] Collar Contracts With Short Puts for Year 2 [Member]	Dec. 31, 2013 Oil contracts [Member] Collar Contracts With Short Puts for Year 3 [Member]	Feb. 20, 2014 Oil contracts [Member] Rollfactor Swap Contracts for March Through December 2014 [Member]	Feb. 20, 2014 Oil contracts [Member] Rollfactor Swap Contracts for Year 2 [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Derivative, Nonmonetary Notional Amount													10,000	0	0	69,000	85,000	25,000	5,000	5,000
Derivative, Swap Type, Average Fixed Price		93.87	0.00	0.00
Derivative, Average Cap Price					114.05		98.98		93.30
Derivative, Average Floor Price					93.70		88.06		85.00
Derivative, Notional Amount, Price Per Unit						77.61		73.06		70.00	0.82	0.60
Swap Multiple Second Nearby Month	0.6667
Swap Multiple Third Nearby Month	0.3333