Oil And Gas Properties (Narrative) (Details) (USD $)	9 Months Ended			9 Months Ended		3 Months Ended	9 Months Ended		9 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011 Domestic Oil And Gas Properties [Member]	Sep. 30, 2012 Domestic Oil And Gas Property D [Member]	Sep. 30, 2012 Domestic Oil And Gas Property B Member	Sep. 30, 2011 Non-Domestic Oil And Gas Property [Member]	Sep. 30, 2012 Non-Domestic Oil And Gas Property [Member]	Sep. 30, 2012 Domestic Oil And Gas Property A Member	Sep. 30, 2012 Domestic Oil And Gas Property C [Member]	Sep. 30, 2012 Hurricane Catastrophic Bond [Member]	Jun. 30, 2012 Hurricane Catastrophic Bond [Member]	Sep. 30, 2012 Hurricane Catastrophic Bond [Member]
Abandonment Expense	$ 13,500,000					$ 4,100,000	$ 13,000,000
Oil and gas property impairments	11,573,000
Capitalized exploration cost		10,500,000			2,300,000			8,100,000
Working interest in oil and gas field				50.00%					70.00%
General insurance expense										8,400,000
Prepaid insurance											10,600,000
Future Insurance Expense Q4												2,000,000
Assets, Fair Value Disclosure			$ 2,900,000