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, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]          
Asset retirement obligation, beginning of period     $ 13,275 $ 12,653  
Liabilities incurred     1,194 1,176  
Liabilities settled     (807) (1,002)  
Accretion expense 174 177 349 353  
Asset retirement obligation as of end of period 14,011 13,180 14,011 13,180  
Less current portion 780 60 780 60 60
Asset retirement obligation, long-term $ 13,231 $ 13,120 $ 13,231 $ 13,120 $ 13,215