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Share Repurchases (Details Textual) (USD $) In Thousands, except Share data, unless otherwise specified	1 Months Ended	3 Months Ended	12 Months Ended		13 Months Ended
	Apr. 30, 2011	Mar. 31, 2012	Dec. 31, 2012	Dec. 31, 2011	May 31, 2013
Share Repurchases (Textual) [Abstract]
Authorized a share repurchase under a stock repurchase plan	$ 50,000		$ 25,000		$ 25,000
Repurchases, shares		82,533	374,000	3,505,000
Cost of repurchases		$ 1,200	$ 4,462

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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