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Allowance Accounts | 12 Months Ended
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Dec. 31, 2023
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, 2023 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Allowance for | ​ | Deferred Tax Asset
​ |  | Credit Losses |  | Valuation Allowance
Balance at December 31, 2020 | ​ | $ | 3,469 | ​ | $ | 19,722
Additions (reductions) (1) | ​ |  | (146) | ​ |  | —
Write-offs (2) | ​ | ​ | (1,846) | ​ | ​ | —
Adjustments (3) | ​ |  | — | ​ |  | (5,675)
Balance at December 31, 2021 | ​ | ​ | 1,477 | ​ | ​ | 14,047
Additions (reductions) (1) | ​ | ​ | 800 | ​ | ​ | —
Adjustments (4) | ​ | ​ | — | ​ | ​ | 8,110
Balance at December 31, 2022 | ​ | ​ | 2,277 | ​ | ​ | 22,157
Additions (reductions) (1) (5) | ​ |  | 1,149 | ​ |  | 51,354
Write-offs (2) | ​ | ​ | (19) | ​ | ​ | —
Adjustments (4) | ​ |  | — | ​ |  | 7,604
Balance at December 31, 2023 | ​ | $ | 3,407 | ​ | $ | 81,115
(1) | The additions (reductions) in allowance for credit losses relate to reserves (releases) for expected credit losses during the respective years.
(2) | 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.
(3) | The decrease in valuation allowance primarily relates to the valuation allowance release for certain of our U.K. operations.
(4) | The increase in valuation allowance relates to current year activity, including adjustments to prior year returns, and the related change in unrealized net deferred tax assets.
(5) | The addition in valuation allowance relates to the adjustment for a change in assessment on the realizability of our Luxembourg net operating losses from remote to less likely than not.
​ See Note 2 for a detailed discussion regarding our accounting policy on accounts receivable and allowance for credit losses. See Note 8 for a detailed discussion of the valuation allowance related to our deferred tax assets.

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