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, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]          
Asset retirement obligation, beginning of period     $ 15,083 $ 13,275  
Liabilities incurred     3,613 1,194  
Liabilities settled     (3,097) (807)  
Accretion expense 189 174 377 349  
Asset retirement obligation as of end of period 15,976 14,011 15,976 14,011  
Less current portion 795 780 795 780 795
Asset retirement obligation, long-term $ 15,181 $ 13,231 $ 15,181 $ 13,231 $ 14,288