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Accrued Final Capping, Closure and Post Closure (Tables)
3 Months Ended
Mar. 31, 2015
Asset Retirement Obligation Disclosure [Abstract]  
Changes to Accrued Capping, Closure and Post-Closure Liabilities

The changes to accrued final capping, closure and post-closure liabilities for the three months ended March 31, 2015 and 2014 are as follows:

 

     Three Months Ended
March 31,
 
     2015      2014  

Beginning balance

   $ 39,829       $ 46,326   

Obligations incurred

     441         736   

Accretion expense

     828         983   

Obligations settled (1)

     (504      (212
  

 

 

    

 

 

 

Ending balance

$ 40,594    $ 47,833   
  

 

 

    

 

 

 

 

(1) Includes amounts that are being processed through accounts payable as a part of our disbursement cycle.