Stock-Based Compensation (Schedule of Qualified Stock Options Outstanding and Excercisable) (Details) (Qualified Stock Options, USD $)			9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2012 $11.45 - $17.85		Sep. 30, 2012 $19.79 - $32.76
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Price, Lower Range Limit			$ 11.45		$ 19.79
Range of Exercise Price, Upper Range Limit			$ 17.85		$ 32.76
Options Outstanding, Shares			112,480		289,250
Options Outstanding, Shares, Total	401,730	377,480
Options Outstanding, Remaining Contractual Life			5 years	[1]	6 years 3 months 26 days	[1]
Options, Outstanding, Exercise Price			$ 12.33	[1]	$ 25.27	[1]
Options Exercisable, Shares			77,480		186,350
Options Exercisable, Shares, Total	263,830
Options Exercisable, Exercise Price			$ 12.72	[1]	$ 22.81	[1]

[1] Weighted Averages