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Asset Retirement Obligations
 9 Months Ended
Sep. 30, 2020
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligations Asset Retirement Obligations
The Company considers its legal obligation to remediate its facilities upon a decommissioning of its radioactive-related operations as an asset retirement obligation. The Company has production facilities which manufacture and process radioactive materials at its North Billerica, Massachusetts and San Juan, Puerto Rico sites. As of September 30, 2020, the liability is measured at the present value of the obligation expected to be incurred, of approximately $26.9 million.
The following table provides a summary of the changes in the Company’s asset retirement obligations:
(in thousands)Amount
Balance at January 1, 2020$12,883 
Accretion expense1,079 
Balance at September 30, 2020$13,962 
The Company is required to provide the U.S. Nuclear Regulatory Commission and Massachusetts Department of Public Health financial assurance demonstrating the Company’s ability to fund the decommissioning of its North Billerica, Massachusetts production facility upon closure, although the Company does not intend to close the facility. The Company has provided this financial assurance in the form of a $28.2 million surety bond.