CLOSURE AND POST-CLOSURE LIABILITIES
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Dec. 31, 2013
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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, 2012 through December 31, 2013 were as follows (in thousands):
All of the landfill facilities included in the above table were active as of December 31, 2013. The changes in estimates for non-landfill retirement liabilities in 2012 were primarily related to one site where the timing of the closure was accelerated. On July 30, 2012, the Company issued $800.0 million senior unsecured notes and on December 7, 2012, the Company issued $600.0 million senior unsecured notes resulting in the Company recalculating its credit-adjusted risk-free rate. New asset retirement obligations were discounted at the rate of 8.56% during the period January through July 2012, 6.66% during the period August through December 7, 2012 and 6.60% thereafter. 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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