Stock-Based Compensation (Schedule of Non-Qualified Stock Options Outstanding and Excercisable) (Details) (Non Qualified Options, USD $)			9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2012 $11.45 - $12.10		Sep. 30, 2012 $13.96 - $19.79		Sep. 30, 2012 $25.02 - $26.45
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Excercise Price, Lower Range Limit			$ 11.45		$ 13.96		$ 25.02
Range of Exercise Price, Upper Range Limit			$ 12.10		$ 19.79		$ 26.45
Options Outstanding, Shares			46,000		3,000		52,500
Options Outstanding, Shares, Total	101,500	112,800
Options Outstanding, Remaining Contractual Life			7 years	[1]	3 years	[1]	7 years 2 months 27 days	[1]
Options Outstanding, Exercise Price			$ 11.45	[1]	$ 19.79	[1]	$ 25.90	[1]
Options Exercisable, Shares			18,400		3,000		28,500
Options Exercisable, Shares, Total	49,900
Options Exercisable, Exercise Price			$ 11.45	[1]	$ 19.79	[1]	$ 25.43	[1]

[1] Weighted Averages