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Note 7 - Segment Reporting - Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Total adjusted EBITDA $ 111,886 $ 102,230 $ 199,014 $ 174,011
Interest expense (10,452) (11,002) (20,724) (21,115)
Depreciation and amortization (14,740) (11,600) (27,347) (23,283)
Non-cash write-down and other adjustments (1) [1] (1,726) (1,316) (326) (2,622)
Non-cash share-based compensation expense (2) [2] (4,334) (3,885) (7,928) (6,991)
Loss on extinguishment of debt [3] 0 (1,332) 0 (1,332)
Transaction costs and credit facility fees (4) [4] (413) (441) (1,699) (703)
Business optimization expenses (5) [5] (73) (29) (242) (167)
Other 385 (12) 539 1
Income before provision for income taxes 80,533 72,613 141,287 117,799
Domestic [Member]        
Total adjusted EBITDA 104,531 90,602 185,506 156,077
International [Member]        
Total adjusted EBITDA $ 7,355 $ 11,628 $ 13,508 $ 17,934
[1] Includes gains/losses on disposal of assets, unrealized mark-to-market adjustments on commodity contracts, and certain foreign currency and purchase accounting 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 a 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] Represents severance and other non-recurring restructuring charges related to the consolidation of certain of our facilities.