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Note 7 - Segment Reporting - Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Total adjusted EBITDA |  | $ 217,679 | $ 123,140 | $ 431,873 | $ 209,164
Interest expense |  | (7,721) | (7,932) | (15,444) | (16,985)
Depreciation and amortization |  | (21,229) | (16,803) | (39,466) | (32,919)
Non-cash write-down and other adjustments | [1] | (1,173) | 893 | 2,695 | (1,391)
Non-cash share-based compensation expense | [2] | (6,973) | (5,400) | (12,421) | (9,974)
Loss on extinguishment of debt | [3] | (831) | 0 | (831) | 0
Transaction costs and credit facility fees | [4] | (5,172) | (358) | (6,086) | (592)
Business optimization and other charges | [5] | 0 | (11,460) | (159) | (11,972)
Other |  | (309) | (15) | (577) | (411)
Income before provision for income taxes |  | 174,271 | 82,065 | 359,584 | 134,920
Domestic [Member] |  |  |  |  |
Total adjusted EBITDA |  | 203,931 | 121,256 | 411,004 | 204,030
International [Member] |  |  |  |  |
Total adjusted EBITDA |  | $ 13,748 | $ 1,884 | $ 20,869 | $ 5,134
[1] | Includes gains/losses on disposals of assets and investments, unrealized mark-to-market adjustments on commodity contracts, and certain foreign currency related 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 the non-cash write-off of original issue discount and deferred financing costs due to voluntary prepayment of Term Loan debt.
[4] | 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.
[5] | For the six months ended June 30, 2021, represents severance and other charges related to the consolidation of certain of our facilities. For the three and six months ended June 30, 2020, represents severance, non-cash asset write-downs, and other charges to address the impact of the COVID-19 pandemic and decline in oil prices.

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