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Note 7 - Segment Reporting - Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Total adjusted EBITDA |  | $ 127,233 | $ 100,075
Interest expense |  | (23,605) | (22,995)
Depreciation and amortization |  | (41,902) | (39,951)
Non-cash write-down and other adjustments | [1] | (510) | 3,160
Non-cash share-based compensation expense | [2] | (12,440) | (10,334)
Transaction costs and credit facility fees | [3] | (1,425) | (1,091)
Business optimization and other charges | [4] | (486) | (1,100)
Provision for regulatory, legal, and clean energy product charges (5) | [5] | (2,535) | (5,800)
Change in fair value of investment (6) | [6] | (6,019) | 0
Other |  | 200 | 46
Income before provision for income taxes |  | 38,511 | 22,010
Domestic [Member] |  |  |
Total adjusted EBITDA |  | 99,175 | 67,662
International [Member] |  |  |
Total adjusted EBITDA |  | $ 28,058 | $ 32,413
[1] | Includes gains/losses on dispositions of assets other than in the ordinary course of business, gains/losses on sales of certain investments, unrealized mark-to-market adjustments on commodity contracts, certain foreign currency related adjustments, and certain purchase accounting and contingent consideration adjustments.
[2] | Represents share-based compensation expense to account for stock options, restricted stock and other stock awards over their respective vesting periods.
[3] | Represents transaction costs incurred directly in connection with any investment, as defined in our credit agreement, equity issuance or debt issuance or refinancing, together with certain fees relating to our senior secured credit facilities, such as administrative agent fees and credit facility commitment fees under our Amended Credit Agreement, which we believe to be akin to, or associated with, interest expense and whose inclusion in Adjusted EBITDA is therefore similar to the inclusion of interest expense in that calculation.
[4] | Represents severance and other restructuring charges related to the consolidation of certain operating facilities and organizational functions.
[5] | Represents the following significant and unusual charges not indicative of our ongoing operations: • A provision for judgments and legal expenses related to certain patent lawsuits - $2,170 in 2024. • Additional customer support costs related to a clean energy product customer that filed for bankruptcy in 2022 – $365 in 2024. • A provision for a matter with the Consumer Product Safety Commission ("CPSC") concerning the imposition of civil fines for allegedly failing to timely submit a report under the Consumer Product Safety Act ("CPSA") in relation to certain portable generators that were subject to a voluntary recall previously announced on July 29, 2021 - $5,800 in the first quarter 2023.
[6] | Represents non-cash gains and losses from changes in the fair value of the Company's investment in warrants and equity securities in Wallbox N.V.

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