Quarterly report pursuant to Section 13 or 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 $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]          
Asset retirement obligation, beginning of period     $ 12,653 $ 10,845  
Liabilities incurred     1,176 449  
Liabilities settled     (1,002)     
Accretion expense 177 164 353 323  
Asset retirement obligation as of end of period 13,180 11,617 13,180 11,617  
Asset retirement obligation, total 13,180 11,617 13,180 11,617  
Less current portion 60 635 60 635 620
Asset retirement obligation, long-term $ 13,120 $ 10,982 $ 13,120 $ 10,982 $ 12,033