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Segment Reporting (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Segment
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Segment Reporting [Abstract]          
Number of operating segments 1        
Sales in the United States representing percentage of total sales (in hundredths) 90.00%   90.00%    
Identifiable long-lived assets 97.00%   97.00%   98.00%
Revenue from External Customer [Line Items]          
Net sales $ 346,688 $ 239,137 $ 746,260 $ 533,698  
Residential power products [Member]
         
Revenue from External Customer [Line Items]          
Net sales 196,616 123,399 451,860 298,476  
Industrial and commercial power products [Member]
         
Revenue from External Customer [Line Items]          
Net sales 133,427 101,101 260,507 206,114  
Other [Member]
         
Revenue from External Customer [Line Items]          
Net sales $ 16,645 $ 14,637 $ 33,893 $ 29,108