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Segment Reporting (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013 Segment	Mar. 31, 2012	Dec. 31, 2012
Segment Reporting [Abstract]
Number of operating segments	1
Sales in the United States representing percentage of total sales (in hundredths)	91.00%	94.00%
Identifiable long-lived assets	98.00%		98.00%
Revenue from External Customer [Line Items]
Net sales	$ 399,572	$ 294,561
Residential power products [Member]
Revenue from External Customer [Line Items]
Net sales	255,244	175,077
Industrial and commercial power products [Member]
Revenue from External Customer [Line Items]
Net sales	127,080	105,013
Other [Member]
Revenue from External Customer [Line Items]
Net sales	$ 17,248	$ 14,471

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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