Shareholder's Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2010	Dec. 31, 2009
Stockholders' Equity Note [Abstract]
Amount of outstanding common stock available to be repurchased	$ 15.0
Shares of common stock repurchased		57,330	53,557
Weighted-average cost of stock repurchased, per share		$ 2.46	$ 2.43
Total remaining authorization under the repurchase program	$ 14.7