Stock Repurchase Program (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2010	Dec. 31, 2008	Dec. 31, 2015	Jan. 25, 2008
Stock Repurchase Program [Abstract]
Shares authorized for repurchase (in shares)				1,000,000
Total number of shares purchased (in shares)	223,051	491,572
Payments for shares purchased	$ 5.2	$ 11.5
Maximum number of shares that may yet be purchased under the Plan			285,377