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ACCRUED LIABILITIES (Tables)
12 Months Ended
Dec. 31, 2011
ACCRUED LIABILITIES [Abstract]  
Accrued liabilities
Accrued liabilities at December 31 consisted of the following (in thousands):

   
2011
  
2010
 
        
Pension and other postretirement benefits
 $55,244  $57,245 
Compensation and related employee costs
  31,205   20,681 
Interest
  25,477   25,962 
Income taxes
  9,878   10,847 
Taxes and other
  9,237   9,804 
Total accrued liabilities
 $131,041  $124,539