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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.

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