Accounting for Stock-Based Compensation (Schedule of Share-based Compensation, Stock Options, Activity) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Sep. 30, 2012
Accounting for Stock-Based Compensation [Abstract]
Beginning Balance, shares	8,338,457	8,487,923	8,389,142	8,389,142
Granted, Shares	3,000	4,000	246,500
Exercised, Shares	(227,737)	(50,018)	(17,244)
Forfeited and Cancelled, Shares	(159,831)	(103,448)	(130,475)
Ending Balance, shares	7,953,889	8,338,457	8,487,923	7,953,889
Beginning of Period, Weighted Average Exercise Price	$ 32.59	$ 32.53	$ 32.83	$ 32.83
Granted, Weighted Average Exercise Price	$ 27.44	$ 21.91	$ 21.07
Exercised, Weighted Average Exercise Price	$ 19.67	$ 19.20	$ 17.88
Forfeited and Cancelled, Weighted Average Exercise Price	$ 35.10	$ 33.38	$ 32.27
End of Period, Weighted Average Exercise Price	$ 32.91	$ 32.59	$ 32.53	$ 32.91
Weighted Average Remaining Contractual Term				4 years 7 months 6 days
Aggregate Intrinsic Value	$ 15,739			$ 15,739
Exercisable, Weighted Average Exercise Price	$ 33.01			$ 33.01
Exercisable, Weighted Average Remaining Contractual Term				3 years 8 months 12 days
Exercisable, Aggregate Intrinsic Value	$ 12,527			$ 12,527
Exercisable, Shares	6,437,632			6,437,632