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Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Stock Repurchase Period
Repurchase of common stock	$ 9,829
Board of Directors
Stock Repurchase Period
Repurchased shares	350,000
Repurchase of common stock	8,522
Repurchased shares, average price (in dollars per share)	$ 24.35
Employee Restricted Stock Awards
Stock Repurchase Period
Repurchased shares	55,631
Repurchase of common stock	$ 1,307
Repurchased shares, average price (in dollars per share)	$ 23.49

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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