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Assets Retirement Obligations (Tables)
12 Months Ended
Dec. 31, 2014
Asset Retirement Obligation Disclosure [Abstract]  
Summary of Asset Retirement Obligation

Changes to the Company’s asset retirement obligation are summarized below:

 

    December 31,  
    2014     2013  
             
Balance, beginning  of period   $ 3,834     $ 4,498  
Additions, changes in estimates and other     136       584  
Liabilities settled     (199 )     (1,638 )
Accretion expense     425       390  
Balance, end of period     4,196       3,834  
Less: Current portion     (196 )     -  
Non-current Portion   $ 4,000     $ 3,834