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Note 7 - Segment Reporting - Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Adjusted EBITDA |  | $ 178,778 | $ 125,953 | $ 387,942 | $ 324,967
Interest expense |  | (8,096) | (10,704) | (25,081) | (31,428)
Depreciation and amortization |  | (17,168) | (15,494) | (50,087) | (42,841)
Non-cash write-down and other adjustments (1) | [1] | (477) | (347) | (1,868) | (673)
Non-cash share-based compensation expense (2) | [2] | (4,353) | (3,549) | (14,327) | (11,477)
Transaction costs and credit facility fees (3) | [3] | (568) | (358) | (1,160) | (2,047)
Business optimization and other charges (4) | [4] | (531) | (567) | (12,503) | (809)
Other |  | (300) | 27 | (711) | 556
Income before provision for income taxes |  | 147,285 | 94,961 | 282,205 | 236,248
Domestic [Member] |  |  |  |  |
Adjusted EBITDA |  | 171,359 | 120,833 | 374,065 | 305,747
International [Member] |  |  |  |  |
Adjusted EBITDA |  | $ 7,419 | $ 5,120 | $ 13,877 | $ 19,220
[1] | Includes certain foreign currency and purchase accounting related adjustments, gains/losses on disposal of assets, and unrealized mark-to-market adjustments on commodity contracts.
[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, debt issuance or refinancing, together with certain fees relating to our senior secured credit facilities.
[4] | For the three months ended September 30, 2020, represents severance and other charges related to the consolidation of certain of our facilities. For the nine months ended September, 30, 2020, represents severance, non-cash asset write-downs, and other charges to address the impact of the COVID-19 pandemic, decline in oil prices, and consolidation of certain of our facilities, consisting of $6,646 and $5,857 classified within costs of goods sold and operating expenses, respectively. For the three and nine months ended September 30, 2019, represents severance and other charges related to the consolidation of certain of our facilities.

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