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Share Repurchase Program (Details) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended	12 Months Ended
	Aug. 06, 2010	Dec. 31, 2011	Dec. 31, 2010
Share Repurchase Program [Abstract]
Stock repurchase program, authorized amount	$ 60.0
Share repurchase program expiration date		September 30, 2011
Common stock repurchased, shares			495,815
Weighted average price			$ 23.79
Common stock repurchased, value			$ 11.8

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern 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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- Definition

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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