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Note 6 - Segment Reporting (Tables)
 6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
Net Sales
  
   
Three Months Ended June 30,
    
Six Months Ended June 30,
  
Reportable Segments
  
2017
    
2016
    
2017
    
2016
  
Domestic
   $
305,907
     $
286,720
     $
554,404
     $
534,736
  
International
    
89,469
      
80,656
      
172,786
      
119,175
  
Total net sales
   $
395,376
     $
367,376
     $
727,190
     $
653,911
  
   
Adjusted EBITDA
  
   
Three Months Ended June 30,
    
Six Months Ended June 30,
  
   
2017
    
2016
    
2017
    
2016
  
Domestic
   $
64,157
     $
57,352
     $
107,003
     $
104,212
  
International
    
6,034
      
6,574
      
10,846
      
9,523
  
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)
    
(1,710
 )    
(2,909
 )    
(1,876
 )    
(2,782
 )
Non-cash share-based compensation expense (2)
    
(3,186
 )    
(2,901
 )    
(5,818
 )    
(5,386
 )
Transaction costs and credit facility fees (3)
    
(420
 )    
(237
 )    
(736
 )    
(760
 )
Business optimization expenses (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
  
Revenue from External Customers by Products and Services [Table Text Block]
   
Net Sales
  
   
Three Months Ended June 30,
    
Six Months Ended June 30,
  
Product Classes
  
2017
    
2016
    
2017
    
2016
  
Residential products
   $
198,117
     $
181,735
     $
352,973
     $
340,716
  
Commercial & industrial products
    
170,755
      
156,730
      
322,198
      
259,720
  
Other
    
26,504
      
28,911
      
52,019
      
53,475
  
Total net sales
   $
395,376
     $
367,376
     $
727,190
     $
653,911