Accounting for Stock-Based Compensation (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012 Y
Options outstanding and exercisable
Beginning Balance, shares	8,389,142
Granted, Shares	246,500
Exercised, Shares	(17,244)
Forfeited and cancelled, Shares	(130,475)
Ending Balance, shares	8,487,923
Beginning of Period, Weighted Average Exercise Price	$ 32.83
Granted, Weighted Average Exercise Price	$ 21.07
Exercised, Weighted Average Exercise Price	$ 17.88
Forfeited and cancelled, Weighted Average Exercise Price	$ 32.27
End of Period, Weighted Average Exercise Price	$ 32.53
Weighted Average Remaining Contractual Term	5.2
Aggregate Intrinsic Value	$ 5,244
Exercisable, Shares	6,802,639
Exercisable, Weighted Average Exercise Price	$ 32.56
Exercisable, Weighted Average Remaining Contractual Term	4.3
Exercisable, Intrinsic Value	$ 4,329