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Cash, Cash Equivalents and Investments (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011
Gross unrealized losses and fair value for available-for-sale investments
Fair Value, Less than 12 months	$ 101,361
Unrealized Losses, Less than 12 months	(1,074)
Fair Value, 12 months or greater	8,596
Unrealized Losses, 12 months or greater	(12)
Fair Value	109,957
Unrealized Losses	(1,086)
Municipal bonds [Member]
Gross unrealized losses and fair value for available-for-sale investments
Fair Value, Less than 12 months	34,657
Unrealized Losses, Less than 12 months	(100)
Fair Value, 12 months or greater	0
Unrealized Losses, 12 months or greater	0
Fair Value	34,657
Unrealized Losses	(100)
Corporate bonds [Member]
Gross unrealized losses and fair value for available-for-sale investments
Fair Value, Less than 12 months	42,094
Unrealized Losses, Less than 12 months	(754)
Fair Value, 12 months or greater	5,316
Unrealized Losses, 12 months or greater	(11)
Fair Value	47,410
Unrealized Losses	(765)
Agency bonds [Member]
Gross unrealized losses and fair value for available-for-sale investments
Fair Value, Less than 12 months	24,610
Unrealized Losses, Less than 12 months	(220)
Fair Value, 12 months or greater	3,280
Unrealized Losses, 12 months or greater	(1)
Fair Value	27,890
Unrealized Losses	$ (221)

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