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Asset Retirement Obligation | 12 Months Ended
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Dec. 31, 2021
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligation | 8. Asset Retirement Obligation The following summarizes the changes in the Company’s asset retirement obligation for the years ended December 31:
($ in thousands) |  | 2021 |  |  | 2020 |
Asset retirement obligation, beginning balance |  | $ | 6,409 |  |  | $ | 6,309 |
Liabilities incurred (a) |  |  | 5,210 |  |  |  | 133 |
Accretion expense |  |  | 308 |  |  |  | 259 |
Liabilities settled |  |  | (103 | ) |  |  | (292 | )
Asset retirement obligation, ending balance |  | $ | 11,824 |  |  | $ | 6,409 |
(a) This includes $3.9 million of asset retirement obligations assumed as part of the Redflex acquisition, and a $1.2 million increase resulting from a change in estimate for the impact of inflation.

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- Definition The entire disclosure for an asset retirement obligation and the associated long-lived asset. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2175671 + Details
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