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ASSET RETIREMENT OBLIGATIONS AND RESTRICTED CASH
 9 Months Ended
Sep. 30, 2020
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligations and Restricted Cash ASSET RETIREMENT OBLIGATIONS AND RESTRICTED CASH
The following table summarizes the Company’s asset retirement obligations:
 September 30, 2020December 31, 2019
Asset retirement obligation, beginning of period$18,972 $19,104 
 Revision of estimate— (2,063)
 Accretion of liabilities1,434 1,931 
Asset retirement obligation, end of period$20,406 $18,972 
Asset retirement obligation:  
 Current$46 $46 
 Non-current20,360 18,926 
Asset retirement obligation, end of period$20,406 $18,972 
The asset retirement obligations of the Company are subject to legal and regulatory requirements. Estimates of the costs of reclamation are reviewed periodically by the Company and the applicable regulatory authorities. The above provision represents the Company’s best estimate of the present value of future reclamation costs, discounted using credit adjusted risk-free interest rates ranging from 9.5% to 11.5% and an inflation rate of 2.0%. The total undiscounted decommissioning liability at September 30, 2020 is $41.75 million (December 31, 2019 - $41.75 million).
The following table summarizes the Company’s restricted cash:
 September 30, 2020December 31, 2019
Restricted cash, beginning of period$20,081 $19,652 
Additional collateral posted179 429 
Refunds of collateral(32)— 
Restricted cash, end of period$20,228 $20,081 
The Company has cash, cash equivalents and fixed income securities as collateral for various bonds posted in favor of the applicable state regulatory agencies in Arizona, Colorado, New Mexico, Texas, Utah and Wyoming, and the U.S. Bureau of Land Management and U.S. Forest Service for estimated reclamation costs associated with the White Mesa Mill, Nichols Ranch, Alta Mesa and other mining properties. Cash equivalents are short-term highly liquid investments with original maturities of three months or less. The restricted cash will be released when the Company has reclaimed a mineral property or restructured the surety and collateral arrangements. See Note 14 for a discussion of the Company’s surety bond commitments.
Cash, cash equivalents and restricted cash are included in the following accounts at September 30, 2020 and December 31, 2019:
September 30, 2020December 31, 2019
Cash and cash equivalents$26,584 $12,810 
Restricted cash included in other long-term assets20,228 20,081 
Total cash, cash equivalents and restricted cash$46,812 $32,891