Monetary Production Payment (Schedule Of Monetary Production Payment Liability) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Monetary Production Payment [Abstract]
Monetary production payment	$ 161,666	$ 166,667
Less: current portion	120,833	74,167
Long-term monetary production payment	$ 40,833	$ 92,500