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Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Stock Repurchase Period
Repurchased shares	350,000	2,450,000
Repurchase of common stock	$ 9,829	$ 44,263	$ 751
Repurchased shares, average price (in dollars per share)	$ 24.35	$ 18.07
Amount authorized to be repurchased	98,300
Employee Restricted Stock Awards
Stock Repurchase Period
Repurchased shares	56,000
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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