Stock Buyback Program (Details) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended	12 Months Ended
	Oct. 31, 2011	Dec. 31, 2011	Jun. 30, 2009
Stock Buyback Program [Abstract]
Repurchase of common stock			1,500,000
Total stock repurchase, shares		2,473,730
Repurchase of common stock, shares	497,412
Repurchase of common stock, value	$ 6.5
Total stock repurchase, value		$ 30.5
Repurchase of common stock, value per share	$ 13.07
Average stock repurchase, value per share		$ 12.34