Stock Buyback Program (Details) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended
	Jun. 30, 2012	Dec. 31, 2012	Jun. 30, 2009
Stock Buyback Program [Abstract]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased			1,500,000
Total stock repurchase, shares		2,878,793
Stock Repurchased and Retired During Period, Shares	405,063
Stock Repurchased and Retired During Period, Value	$ 6.4
Total stock repurchase, value		$ 36.9
Repurchase of common stock, value per share		$ 12.83
Average stock repurchase, value per share	$ 15.82