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Note 6 - Segment Reporting - Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Net sales $ 395,376 $ 367,376 $ 727,190 $ 653,911
Total adjusted EBITDA 70,191 63,926 117,849 113,735
Interest expense (10,893) (11,380) (21,681) (22,415)
Depreciation and amortization (12,986) (13,650) (25,583) (26,443)
Non-cash write-down and other adjustments (1) [1] (1,710) (2,909) (1,876) (2,782)
Non-cash share-based compensation expense (2) [2] (3,186) (2,901) (5,818) (5,386)
Transaction costs and credit facility fees (3) [3] (420) (237) (736) (760)
Business optimization expenses (4) [4] (1,346) (1,446) (7,106)
Other 209 15 250 (48)
Income before provision for income taxes 39,859 32,864 60,959 48,795
Domestic [Member]        
Net sales 305,907 286,720 554,404 534,736
Total adjusted EBITDA 64,157 57,352 107,003 104,212
International [Member]        
Net sales 89,469 80,656 172,786 119,175
Total adjusted EBITDA $ 6,034 $ 6,574 $ 10,846 $ 9,523
[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 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] Represents charges relating to business optimization and restructuring costs.