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Shareholders' Equity (Details) (USD $) Share data in Thousands, unless otherwise specified	0 Months Ended			3 Months Ended
	May 24, 2011	May 25, 2011	Feb. 22, 2011	Mar. 31, 2013
Shareholders' Equity [Abstract]
Shareholder's plan, expiration date				Jan. 31, 2012
Authorized repurchase of common stock, amount	$ 15,000,000	$ 20,000,000	$ 15,000,000
Repurchase of common stock, shares				104
Repurchase of common stock, net				$ 213,000

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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