Annual report pursuant to Section 13 and 15(d)

Property And Equipment (Schedule Of Asset Retirement Obligation) (Details)

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Property And Equipment (Schedule Of Asset Retirement Obligation) (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Property And Equipment [Abstract]      
Asset retirement obligation, beginning of period $ 10,845,000 $ 10,153,000  
Liabilities incurred 1,390,000 1,328,000 361,000
Liabilities settled (248,000) (1,253,000) (59,000)
Accretion expense 666,000 617,000 582,000
Asset retirement obligation as of end of period 12,653,000 10,845,000 10,153,000
Less current portion 620,000 635,000  
Asset retirement obligation, long-term $ 12,033,000 $ 10,210,000