Quarterly report pursuant to Section 13 or 15(d)

Property And Equipment (Narrative) (Details)

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Property And Equipment (Narrative) (Details) (USD $)
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Property And Equipment [Abstract]    
Cumulative capitalization of general and administrative costs incurred and capitalized to the full cost pool $ 25,470,000  
Capitalized general and administrative costs $ 1,976,000 $ 1,377,000