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ACCRUED CLOSURE COSTS (Tables)
12 Months Ended
Dec. 31, 2012
ACCRUED CLOSURE COSTS [Abstract]  
Changes to reported closure liabilities
Changes to reported closure liabilities for the years ended December 31, 2011 and 2012, were as follows:

Amounts in thousands
   
Balance as of December 31, 2010
 
$
12,362
 
Accretion expense
  
79
 
Payments
  
 
Adjustments
  
(504
)
Balance as of December 31, 2011
  
11,937
 
Accretion expense
  
185
 
Payments
  
(773
)
Adjustments
  
 
Balance as of December 31, 2012
 
$
11,349