Stock-Based Compensation (Schedule of Qualified Stock Options Outstanding and Excercisable) (Details) (Qualified Stock Options, USD $)			6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2012 Qualified Stock Options Excercise Price Range $11.45- $17.85		Jun. 30, 2012 Qualified Stock Options Exercise Price Range $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			124,880		292,350
Options Outstanding, Shares, Total	417,230	377,480
Options Outstanding, Remaining Contractual Life (yrs)			4 years 11 months 16 days	[1]	6 years 4 months 2 days	[1]
Options, Outstanding, Exercise Price			$ 12.27		$ 25.30
Options Exercisable, Shares			88,680		186,750
Options Exercisable, Shares, Total	275,430
Options Exercisable, Exercise Price			$ 12.60	[1]	$ 22.82	[1]

[1] Weighted Averages