Quarterly Financial Data (Narrative) (Details) (USD $)	3 Months Ended
	Dec. 31, 2011 Owners	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2009	Sep. 30, 2009	Jun. 30, 2009	Mar. 31, 2009
Quarterly Financial Data [Abstract]
Restructuring charges, per share	$ (0.1)	$ (0.06)	$ (0.04)	$ 0.0	$ (0.03)	$ (0.04)	$ (0.01)	$ (0.04)	$ (0.02)	$ (0.62)	$ (1.05)	$ (0.57)
Gain on extinguishment, per share									$ 0.09	$ 0.16	$ 0.73	$ 0.06
Purchase price adjustment, per share											$ (0.33)
Per share tax effect from prior period corrections	$ 0.11
Number of beneficial owners, including employees owning shares through the Company's 401(k)	6,600