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Asset Retirement Obligations
 9 Months Ended
Sep. 30, 2021
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligations Asset Retirement Obligations
The Company’s asset retirement obligations include the costs associated with the removal of its structures, resurfacing of the land and retirement cost, if applicable, related to the Company’s outdoor advertising portfolio. The following table reflects information related to our asset retirement obligations:
Balance at December 31, 2020$222,876 
Additions to asset retirement obligations2,363 
Revision in estimates41,363 
Accretion expense3,053 
Liabilities settled(2,631)
Balance at September 30, 2021$267,024 
Revision in estimates of $41,363 reflects changes in cost estimates to remove structures and resurface land for structures that reside on leased land in the Company's outdoor advertising portfolio.