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Note 7 - Segment Reporting - Net Sales by Products and Services (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Net sales $ 397,634 $ 330,485
Total adjusted EBITDA 71,781 46,703
Interest expense (10,113) (10,788)
Depreciation and amortization (11,683) (12,597)
Non-cash write-down and other adjustments (1) [1] (1,306) (166)
Non-cash share-based compensation expense (2) [2] (3,106) (2,632)
Transaction costs and credit facility fees (3) [3] (262) (316)
Business optimization expenses (4) [4] (138) (100)
Other 13 (99)
Income before provision for income taxes 45,186 20,005
Domestic [Member]    
Net sales 300,219 247,168
Total adjusted EBITDA 65,475 41,891
International [Member]    
Net sales 97,415 83,317
Total adjusted EBITDA 6,306 4,812
Residential Power Products [Member]    
Net sales 190,474 154,217
Residential Power Products [Member] | Domestic [Member]    
Net sales 176,685 141,701
Residential Power Products [Member] | International [Member]    
Net sales 13,789 12,516
Commercial and Industrial Power Products [Member]    
Net sales 175,125 150,753
Commercial and Industrial Power Products [Member] | Domestic [Member]    
Net sales 97,771 84,765
Commercial and Industrial Power Products [Member] | International [Member]    
Net sales 77,354 65,988
Other Products and Services [Member]    
Net sales 32,035 25,515
Other Products and Services [Member] | Domestic [Member]    
Net sales 25,763 20,702
Other Products and Services [Member] | International [Member]    
Net sales $ 6,272 $ 4,813
[1] Includes gains/losses on disposal of assets, unrealized mark-to-market adjustments on commodity contracts, foreign currency gains/losses and certain 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.