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Cash, Cash Equivalents and Investments (Details 2) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2011
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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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