Quarterly Financial Data (Narrative) (Details) (USD $)	3 Months Ended
	Dec. 31, 2012 Owners	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010
Quarterly Financial Data [Abstract]
Restructuring charges, per share	$ 0.02	$ 0.05	$ 0.06	$ 0.01	$ 0.1	$ 0.06	$ 0.04	$ 0.0	$ 0.02	$ 0.02	$ 0.01	$ 0.03
Pension plan settlement, per share			$ 2.34	$ 0.22
Tax settlement, per share				$ 0.23
Per share tax effect from prior period corrections					$ 0.11
Number of beneficial owners, including employees owning shares through the Company's 401(k)	5,500