Stock-Based Compensation (Schedule of Qualified Stock Options Outstanding and Excercisable) (Details) (Qualified Stock Options, USD $)			3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 $11.45 - $17.85		Mar. 31, 2013 $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			86,780		206,750
Options Outstanding, Shares, Total	293,530	330,730
Remaining Contractual Life(yrs)			4 years 6 months 11 days	[1]	6 years 3 months 4 days	[1]
Options, Outstanding, Exercise Price			$ 12.47	[1]	$ 26.43	[1]
Options Exercisable, Shares			53,580		106,350
Options Exercisable, Shares, Total	159,930
Options Exercisable, Exercise Price			$ 13.11	[1]	$ 23.41	[1]

[1] Weighted Averages