Benefit Plans (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 30, 2012
Share-based compensation arrangement by stock option and restricted stock unit activity
Beginning Balance, Shares Available for Grant	7,835
Beginning Balance, Stock Options Outstanding, Number of Shares	9,303
Beginning Balance, RSUs Outstanding, Number of Shares	3,713
Beginning Balance, Restricted Stock Units, Weighted Average Grant Date Fair Value	$ 7.52
Beginning Balance, Stock Options, Weighted Average Exercise Price	$ 7.12
Options Granted, Stock Options Outstanding	899
Option Granted, Shares Available for Grant	(3,835)
Stock Options, Granted, Weighted Average Exercise Price	$ 6.14
Restricted Stock Units, Granted, Number of Shares	1,957
Restricted Stock Units, Granted, Weighted Average Grant Date Fair Value	$ 6.10
Stock Options exercised, Number of Shares	(129)
Stock Options exercised, Weighted Average Exercise Price	$ 2.93
Restricted Stock Units, Shares released, Number of Shares	(649)
Restricted Stock Units, Shares released, Weighted Average Grant Date Fair Value	$ 8.29
Options Forfeited or cancelled, Shares Available for Grant	815
Stock Options Forfeited or cancelled, Number of Shares	(722)
Stock Options Forfeited or cancelled, Weighted Average Exercise Price	$ 9.28
Restricted Stock Units Forfeited or cancelled, Number of Shares	(273)
Restricted Stock Units Forfeited or cancelled, Weighted Average Grant Date Fair Value	$ 6.73
Ending Balance, Shares Available for Grant	4,815
Ending Balance, Stock Options, Number of Shares	9,351
Ending Balance, RSUs, Number of Shares	4,748
Ending Balance, Restricted Stock Units, Weighted Average Grant Date Fair Value	$ 6.77
Ending Balance, Stock Options, Weighted Average Exercise Price	$ 6.92