Monetary Production Payment (Narrative) (Details) (USD $)	1 Months Ended			1 Months Ended		3 Months Ended	1 Months Ended		3 Months Ended
	Jan. 31, 2014	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2013 Alba And Bacchus Fields [Member]	Aug. 31, 2013 Alba And Bacchus Fields [Member]	May 31, 2013 Alba And Bacchus Fields [Member]	Apr. 30, 2015 Scenario, Forecast [Member]	Jan. 31, 2015 Scenario, Forecast [Member]	Dec. 31, 2014 Scenario, Forecast [Member]	Sep. 30, 2014 Scenario, Forecast [Member]	Jun. 30, 2014 Scenario, Forecast [Member]	Mar. 31, 2014 Minimum [Member] Scenario, Forecast [Member]	Mar. 31, 2014 Maximum [Member] Scenario, Forecast [Member]
Long-Term Liabilites [Line Items]
Monetary production payment		$ 161,666,000	$ 166,667,000	$ 25,000,000	$ 25,000,000	$ 125,000,000
Additional monetary production payment implied cost				9.75%	8.75%	10.00%
Principal payment amount	5,000,000
Expected principal payment							$ 51,700,000	$ 51,700,000	$ 5,800,000	$ 5,800,000	$ 5,800,000	$ 10,000,000	$ 18,000,000