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Note 7 - Segment Reporting - Segment Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Total adjusted EBITDA |  | $ 861,425 | $ 583,773 | $ 454,115
Interest expense |  | (32,953) | (32,991) | (41,544)
Depreciation and amortization |  | (92,041) | (68,773) | (60,767)
Non-cash write-down and other adjustments | [1] | 3,070 | 327 | (240)
Non-cash share-based compensation expense | [2] | (23,954) | (20,882) | (16,694)
Loss on extinguishment of debt | [3] | (831) | 0 | (926)
Loss on pension settlement | [4] | 0 | 0 | (10,920)
Transaction costs and credit facility fees | [5] | (22,357) | (2,151) | (2,724)
Business optimization and other charges | [6] | (33) | (12,158) | (1,572)
Other |  | (800) | (954) | 879
Income before provision for income taxes |  | 691,526 | 446,191 | 319,607
Assets |  | 4,877,780 | 3,235,423 | 2,665,669
Depreciation and Amortization |  | 92,041 | 68,773 | 60,909
Capital expenditures |  | 109,992 | 62,128 | 60,802
Domestic [Member] |  |  |  |
Total adjusted EBITDA |  | 795,417 | 563,394 | 428,667
Assets |  | 3,742,101 | 2,659,597 | 2,123,251
Depreciation and Amortization |  | 66,675 | 53,020 | 46,145
Capital expenditures |  | 100,672 | 51,867 | 36,007
International [Member] |  |  |  |
Total adjusted EBITDA |  | 66,008 | 20,379 | 25,448
Assets |  | 1,135,679 | 575,826 | 542,418
Depreciation and Amortization |  | 25,366 | 15,753 | 14,764
Capital expenditures |  | $ 9,320 | $ 10,261 | $ 24,795
[1] | Includes gains/losses on disposal of assets and investments, unrealized mark-to-market adjustments on commodity contracts, certain foreign currency related adjustments, and certain purchase accounting 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 a voluntary prepayment of Term Loan debt.
[4] | Represents pre-tax settlement charges related to the termination of the Company’s domestic pension plan in the fourth quarter of 2019.
[5] | Represents transaction costs incurred directly in connection with any investment (including acquisitions), as defined in our credit agreement, equity issuance, debt issuance or refinancing, together with certain fees relating to our senior secured credit facilities.
[6] | For the year ended December 31, 2021, and December 31, 2019, represents severance and other charges related to the consolidation of certain of our facilities. For the year ended December 31, 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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