CLOSURE AND POST-CLOSURE LIABILITIES
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Dec. 31, 2011
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Asset Retirement Obligation Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
CLOSURE AND POST-CLOSURE LIABILITIES | CLOSURE AND POST-CLOSURE LIABILITIES The changes to closure and post-closure liabilities (also referred to as "asset retirement obligations"), from January 1, 2010 through December 31, 2011 were as follows (in thousands):
All of the landfill facilities included in the above were active as of December 31, 2011. New asset retirement obligations incurred in 2011 are being discounted at the credit-adjusted risk-free rate of 8.79% and inflated at a rate of 1.01%. New asset retirement obligations incurred in 2010 were discounted at the credit-adjusted risk-free rate of 9.74% and inflated at a rate of 1.02%. Anticipated payments (based on current estimated costs and anticipated timing of necessary regulatory approvals to commence work on closure and post-closure activities) for each of the next five years and thereafter are as follows (in thousands):
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