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Allowance Accounts | 12 Months Ended
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Dec. 31, 2022
Credit Loss [Abstract] |
Allowance Accounts | Note 18 — Allowance Accounts The following table sets forth the activity in our valuation accounts for each of the three years in the period ended December 31, 2022 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Allowance for | ​ | Deferred Tax Asset
​ |  | Credit Losses |  | Valuation Allowance
Balance at December 31, 2019 | ​ | $ | — | ​ | $ | 18,631
Additions (reductions) (1) | ​ |  | 2,684 | ​ |  | —
Adjustments (2) | ​ |  | 785 | ​ |  | 1,091
Balance at December 31, 2020 | ​ | ​ | 3,469 | ​ | ​ | 19,722
Additions (reductions) (1) | ​ | ​ | (146) | ​ | ​ | —
Write-offs (3) | ​ | ​ | (1,846) | ​ | ​ | ​
Adjustments (4) | ​ | ​ | — | ​ | ​ | (5,675)
Balance at December 31, 2021 | ​ | ​ | 1,477 | ​ | ​ | 14,047
Additions (reductions) (1) | ​ |  | 800 | ​ |  | —
Adjustments (5) | ​ |  | — | ​ |  | 8,110
Balance at December 31, 2022 | ​ | $ | 2,277 | ​ | $ | 22,157
(1) | Additions (reductions) in allowance for credit losses reflect credit loss reserves (releases) during the respective years, including a $1.7 million credit loss reserve in 2020 related to a receivable in our Robotics segment. Additions during 2022 primarily reflected adjustments to the allowance for credit losses due to increases in our expected credit losses as a result of the Alliance acquisition.
(2) | The adjustment in allowance for credit losses reflects provision for current expected credit losses upon the adoption of ASU No. 2016-13 on January 1, 2020.
(3) | The write-offs of allowance for credit losses reflect certain receivables related to our Robotics segment that were previously reserved and subsequently deemed to be uncollectible.
(4) | The decrease in valuation allowance primarily relates to the valuation allowance release for certain of our U.K. operations.
(5) | The increase in valuation allowance relates to current year activity and the related change in unrealizable net deferred tax assets.
See Note 2 for a detailed discussion regarding our accounting policy on accounts receivable and allowance for credit losses as well as the adoption of ASU No. 2016-13. See Note 8 for a detailed discussion of the valuation allowance related to our deferred tax assets.

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- Definition The entire disclosure for allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -URI https://asc.fasb.org/topic&trid=2196771 + Details
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- References No definition available. + Details
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