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Segment Reporting (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Segment	Sep. 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)	87.00%		89.00%
Identifiable long-lived assets	90.00%		90.00%		98.00%
Revenue from External Customer [Line Items]
Net sales	$ 363,269	$ 300,586	$ 1,109,529	$ 834,284
Residential power products [Member]
Revenue from External Customer [Line Items]
Net sales	192,728	190,974	644,588	489,454
Industrial and commercial power products [Member]
Revenue from External Customer [Line Items]
Net sales	151,488	93,607	411,995	299,718
Other [Member]
Revenue from External Customer [Line Items]
Net sales	$ 19,053	$ 16,005	$ 52,946	$ 45,112

X

- Definition

Percentage representing company's identifiable long-lived assets are located in the United States.

+ References

No definition available.

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X

- Definition

Percentage representing sales from particular country in terms of total sales.

+ References

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- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

+ References

No definition available.

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X

- Definition

Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(a))

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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