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Common Stock Repurchase Program (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2010	Sep. 30, 2012	Dec. 31, 2011
Equity, Class of Treasury Stock [Line Items]
Stock Repurchase Program, Period in Force	2 years
Stock Repurchased During Period, Value			$ 3.9
Stock Repurchase Program, Remaining Authorized Repurchase Amount		16.1
Maximum [Member]
Equity, Class of Treasury Stock [Line Items]
Stock Repurchase Program, Authorized Amount	20.0

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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