Stock-Based Compensation Options (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2011 years payment
Shares [Abstract]
Options Outstanding at December 31, 2010	5,129
Options Granted	563
Options Exercised	(134)
Options Canceled	(552)
Options Outstanding at June 30, 2011	5,006
Options Vested and Expected to Vest, Outstanding	4,981
Options Exercisable Shares June 30, 2011	3,526
Weighted Average Exercise Price [Abstract]
Options Outstanding, Weighted Average Exercise Price, Beginning Balance	$ 21.27
Options Granted, Weighted Average Exercise Price	$ 17.45
Options Exercised, Weighted Average Exercise Price	$ 17.60
Options Canceled, Weighted Average Exercise Price	$ 21.12
Options Outstanding, Weighted Average Exercise Price Ending Balnce	$ 20.96
Options Vested and Expected to Vest, Weighted Average Exercise Price	$ 20.97
Options Exercisable, Weighted Average Exercise Price, End Of Period	$ 22.09
Weighted Average Remaining Contractual Term [Abstract]
Options Outstanding, Weighted Average Remaining Contractual Term	4.8
Options, Vested and Expected to Vest, Weighted Average Remaining Contractual Term	4.8
Option Exercisable, Weighted Average Remaining Contractual Term	3.0
Intrinsic Value [Abstract]
Options Outstanding, Intrinsic Value	$ 1,382,000
Options, Vested and Expected to Vest, Aggregate Intrinsic Value	1,382,000
Options Exercisable, Intrinsic Value	1,382,000
Unrecognized Compensation Cost [Abstract]
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$ 7,800,000
Nonvested Stock Options Weighted Average Remaining Period	2.9
Employee Stock Purchase Plan [Abstract]
Employee Stock Purchase Plan Percent of Stock Price At Closing Date	85.00%