Quarterly Financial Data (Narrative) (Details)	3 Months Ended
	Dec. 31, 2015 owners $ / shares	Sep. 30, 2015 $ / shares	Jun. 30, 2015 $ / shares	Mar. 31, 2015 $ / shares	Dec. 31, 2014 $ / shares	Sep. 30, 2014 $ / shares	Jun. 30, 2014 $ / shares	Mar. 31, 2014 $ / shares	Dec. 31, 2013 $ / shares	Sep. 30, 2013 $ / shares	Jun. 30, 2013 $ / shares	Mar. 31, 2013 $ / shares
Quarterly Financial Data [Abstract]
Restructuring charges, per share	$ (0.21)	$ (0.07)	$ (0.02)	$ (0.18)	$ (0.04)	$ (0.02)	$ (0.04)	$ (0.02)	$ (0.03)	$ (0.04)	$ (0.47)	$ (0.01)
Discrete income tax adjustments, per share	$ 0.85	$ (0.15)	$ 0.00	(0.01)
Gain related to the sale of investment, per share				$ 0.02
Gain related to insurance recovery, per share						$ 0.01	$ 0.03
Pension plan settlement, per share					$ (0.16)
Gain on sale of assets, per share												$ 0.08
Number of beneficial owners, including employees owning shares through the Company's 401(k) | owners	7,500