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Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2012
Fair Value Measurements [Abstract]  
Schedule of Changes In Asset Retirement Obligation
         
    Asset
Retirement
Obligation
 

Balance, December 31, 2011

  $ 1,845  

Additional asset retirement obligation

    13  

Accretion expense

    56  

Settlements

    (92
   

 

 

 

Balance, June 30, 2012

  $ 1,822