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Significant Accounting Policies, Continued (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Segment
Dec. 31, 2012
Dec. 31, 2011
Segment Reporting [Abstract]                      
Number of Operating Segments                 1    
Sales in the United States representing percentage of total sales (in hundredths)                 88.00% 93.00% 95.00%
Identifiable long-lived assets in the United States representing percentage of total identifiable long-lived assets (in hundredths)                 90.00% 98.00% 100.00%
Reconciliation from Segment Totals to Consolidated [Abstract]                      
Net sales $ 376,236 $ 363,269 $ 346,688 $ 399,572 $ 342,022 $ 300,586 $ 239,137 $ 294,561 $ 1,485,765 $ 1,176,306 $ 791,976
Residential power products [Member]
                      
Reconciliation from Segment Totals to Consolidated [Abstract]                      
Net sales                 843,727 705,444 491,016
Commercial & industrial power products [Member]
                      
Reconciliation from Segment Totals to Consolidated [Abstract]                      
Net sales                 569,890 410,341 250,270
Other [Member]
                      
Reconciliation from Segment Totals to Consolidated [Abstract]                      
Net sales                 72,148 60,521 50,690
Derivatives designated as hedging instruments [Member] | Interest rate swaps [Member] | Interest expense [Member]
                      
Derivative Instruments, Gain (Loss) [Line Items]                      
Amount of gain (loss) recognized in AOCI                 774 [1] 365 [1] (683) [1]
Amount of loss reclassified from AOCI into net income (loss)                 0 [1] 0 [1] 0 [1]
Amount of gain (loss) recognized in net income (loss) on hedges (ineffective portion)                 0 [1] 0 [1] 0 [1]
Derivatives not designated as hedging instruments [Member] | Interest rate swaps [Member] | Interest expense [Member]
                      
Derivative Instruments, Gain (Loss) [Line Items]                      
Amount of gain (loss) recognized in AOCI                 0 [2] 0 [2] 0 [2]
Amount of loss reclassified from AOCI into net income (loss)                 (2,381) [2] (2,082) [2] 0 [2]
Amount of gain (loss) recognized in net income (loss) on hedges (ineffective portion)                 2,937 [2] 1,695 [2] 0 [2]
Derivatives not designated as hedging instruments [Member] | Commodity and foreign currency contracts [Member] | Cost of goods sold [Member]
                      
Derivative Instruments, Gain (Loss) [Line Items]                      
Amount of gain (loss) recognized in AOCI                 0 0 0
Amount of loss reclassified from AOCI into net income (loss)                 0 0 0
Amount of gain (loss) recognized in net income (loss) on hedges (ineffective portion)                 $ (661) $ 386 $ (861)
[1] Amounts recorded for the twelve months ended December 31, 2012 and 2011 relate to the interest rate swap agreements outstanding prior to May 30, 2012, the date the hedging relationships for these agreements were terminated.
[2] Amounts recorded for the twelve months ended December 31, 2013 and 2012 relate to interest rate swap agreements outstanding as of May 30, 2012, the date the hedging relationships for these agreements were terminated.