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Note 7 - Segment Reporting - Segment Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Total adjusted EBITDA $ 825,367 $ 861,425 $ 583,773
Interest expense (54,826) (32,953) (32,991)
Depreciation and amortization (156,141) (92,041) (68,773)
Non-cash write-down and other adjustments [1] 2,091 3,070 327
Non-cash share-based compensation expense [2] (29,481) (23,954) (20,882)
Loss on extinguishment of debt [3] (3,743) (831) 0
Transaction costs and credit facility fees [4] (5,026) (22,357) (2,151)
Business optimization and other charges [5] (4,371) (33) (12,158)
Provision for regulatory and clean energy product charges (6) [6] (65,265) 0 0
Other (139) (800) (954)
Income before provision for income taxes 508,466 691,526 446,191
Assets 5,169,462 4,877,780 3,235,423
Depreciation and Amortization 156,141 92,041 68,773
Capital expenditures 86,188 109,992 62,128
Domestic [Member]      
Total adjusted EBITDA 716,302 795,417 563,394
Assets 4,032,086 3,742,101 2,659,597
Depreciation and Amortization 123,768 66,675 53,020
Capital expenditures 69,680 100,672 51,867
International [Member]      
Total adjusted EBITDA 109,065 66,008 20,379
Assets 1,137,376 1,135,679 575,826
Depreciation and Amortization 32,373 25,366 15,753
Capital expenditures $ 16,508 $ 9,320 $ 10,261
[1] Includes gains/losses on disposals of assets and 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 the non-cash write-off of original issue discount and deferred financing costs due primarily to a voluntary prepayment of 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 year-ended December 31, 2022, predominantly represents severance and other restructuring charges related to the suspension of operations at 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 on demand for C&I products. These charges represent expenses that are nonrecurring and do not reflect our ongoing operations.
[6] Represents a specific credit loss provision of $17,926 for a clean energy product customer that filed for bankruptcy, as well as a warranty provision of $37,338 to address certain clean energy product warranty-related matters and a provision of $10,000 for a specific and unresolved regulatory matter with the Consumer Product Safety Commission.