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Changes In Stockholders' Equity (Narrative) (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	1 Months Ended	3 Months Ended		6 Months Ended	12 Months Ended
	Sep. 30, 2007	Jun. 30, 2011	Mar. 31, 2011	Jun. 30, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Changes In Stockholders' Equity
Share repurchase program, authorized amount	$ 75
Share repurchase program, shares repurchased	1,643	0	0		0	0	0
Share repurchase program, repurchased amount	31.4
Authorized amount remaining for stock repurchases				$ 43.6
Repurchase program expiration date, years		0		0

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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