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Subsequent Events (Details) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended		1 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Aug. 09, 2012 Repurchase of Common Stock [Member]
Subsequent Event [Line Items]
Common shares repurchased during period			280,818
Payments for repurchase of common stock	$ 9,396	$ 26,198	$ 5,800
Payments for repurchase of common stock (per share)			$ 20.49

The cash outflow to reacquire common stock during the period.

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- Definition

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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