Stock Repurchase Program (Details) (2009 Stock Repurchase Program [Member], USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Mar. 13, 2013	Feb. 27, 2013
Equity, Class of Treasury Stock [Line Items]
Stock Repurchase Program, Authorized Amount				$ 12.0	$ 7.0
Stock Repurchase Program, Remaining Authorized Repurchase Amount			$ 6.3
Common Stock [Member]
Equity, Class of Treasury Stock [Line Items]
Stock Repurchased During Period, Shares	1,514,843	490,816