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Commitments and Contingencies Commitments and Contingencies Narrative (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Reduction in YTD Q3 2010 revenue due to restatement					$ 6,100,000
Impact of Restatement on Earnings Per Share, Diluted					$ 0.11
Other changes/adjustments to warranties	(1,552,000)	26,263,000	509,000	40,906,000
Recovery Associated With Settlement Of Product Claims				8,600,000
A specific batch of C&I meters that were manufactured with a misaligned automated solder-feeder [Member]
Other changes/adjustments to warranties	(5,000,000)
Warranty charge related to certain products in Brazil. [Member]
Other changes/adjustments to warranties				$ 7,700,000

Expressed in per-share terms, the dollar amount of the impact of a restatement of the results of operations of a prior period on the Diluted Earnings Per Share data given for the prior period or periods.

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- Definition

Resulting effect of restatement to correct an error, before tax effects, on the net income of prior periods for the year in which any adjustments are first made. In statements containing more than one period, discloses the effects for each period.

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