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Note 7 - Segment Reporting - Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Adjusted EBITDA $ 123,140 $ 111,886 $ 209,164 $ 199,014
Interest expense (7,932) (10,452) (16,985) (20,724)
Depreciation and amortization (16,803) (14,740) (32,919) (27,347)
Non-cash write-down and other adjustments (1) [1] 893 (1,726) (1,391) (326)
Non-cash share-based compensation expense (2) [2] (5,400) (4,334) (9,974) (7,928)
Transaction costs and credit facility fees (3) [3] (358) (413) (592) (1,699)
Business optimization and other charges (4) [4] (11,460) (73) (11,972) (242)
Other (15) 385 (411) 539
Income before provision for income taxes 82,065 80,533 134,920 141,287
Domestic [Member]        
Adjusted EBITDA 121,256 103,686 204,030 184,914
International [Member]        
Adjusted EBITDA $ 1,884 $ 8,200 $ 5,134 $ 14,100
[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 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, consisting of $6,318 and $6,419 classified within costs of goods sold and $5,142 and $5,553 classified within operating expenses, respectively. For the three and six months ended June 30, 2019, represents severance and other charges related to the consolidation of certain of our facilities.