Supplemental Disclosures About Oil And Gas Producing Activities (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Average Sales Price and Production Costs Per Unit of Production [Line Items]
Capitalized interest	$ 29,889	$ 24,848	$ 23,369
Reserves discount factor	10.00%
Crude Oil And Condensate, Per Barrel [Member]
Average Sales Price and Production Costs Per Unit of Production [Line Items]
Average market prices used in reserves estimates	99.44	102.03	95.28
Natural Gas Liquids (Bbls) [Member]
Average Sales Price and Production Costs Per Unit of Production [Line Items]
Average market prices used in reserves estimates	25.60	32.12	44.90
Natural Gas, Per Thousand Cubic Feet [Member]
Average Sales Price and Production Costs Per Unit of Production [Line Items]
Average market prices used in reserves estimates	2.97	2.08	3.24