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Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2013
Accounting Policies [Abstract]  
Change in Asset Retirement Obligation Account Activity

Activity in the asset retirement obligation account for the years ended December 31, is as follows:

 

     2013      2012  

Balance, beginning

   $ 154       $ 149   

Accretion of liability due to passage of time

     6         5   

Amortization of asset due to passage of time

     —           —     
  

 

 

    

 

 

 

Balance, ending

   $ 160       $ 154