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Cash, Cash Equivalents and Investments (Details 1) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | ---
Summary of available-for-sale investments |  |
Amortized Cost | $ 313,277 |
Gross Unrealized Gains | 1,213 |
Gross Unrealized Losses | (1,086) |
Fair Value, Short-term investments | 144,431 | 147,823
Fair Value, Total | 313,404 |
Treasury bills [Member] |  |
Summary of available-for-sale investments |  |
Fair Value, Short-term investments | 1,945 | 2,494
Fair Value, Total | 1,945 |
Treasury bills [Member] | Short-term investments [Member] |  |
Summary of available-for-sale investments |  |
Amortized Cost | 1,944 |
Gross Unrealized Gains | 1 |
Gross Unrealized Losses | 0 |
Fair Value, Short-term investments | 1,945 |
Municipal bonds [Member] |  |
Summary of available-for-sale investments |  |
Fair Value, Short-term investments | 54,036 | 75,457
Fair Value, Long-term investments | 69,680 | 34,794
Fair Value, Total | 123,716 |
Municipal bonds [Member] | Short-term investments [Member] |  |
Summary of available-for-sale investments |  |
Amortized Cost | 53,974 |
Gross Unrealized Gains | 65 |
Gross Unrealized Losses | (3) |
Fair Value, Short-term investments | 54,036 |
Municipal bonds [Member] | Long-term investments [Member] |  |
Summary of available-for-sale investments |  |
Amortized Cost | 69,576 |
Gross Unrealized Gains | 201 |
Gross Unrealized Losses | (97) |
Corporate bonds [Member] |  |
Summary of available-for-sale investments |  |
Fair Value, Short-term investments | 55,570 | 34,543
Fair Value, Long-term investments | 59,902 | 36,762
Fair Value, Total | 115,472 |
Corporate bonds [Member] | Short-term investments [Member] |  |
Summary of available-for-sale investments |  |
Amortized Cost | 56,277 |
Gross Unrealized Gains | 32 |
Gross Unrealized Losses | (739) |
Fair Value, Short-term investments | 55,570 |
Corporate bonds [Member] | Long-term investments [Member] |  |
Summary of available-for-sale investments |  |
Amortized Cost | 59,461 |
Gross Unrealized Gains | 467 |
Gross Unrealized Losses | (26) |
Agency bonds [Member] |  |
Summary of available-for-sale investments |  |
Fair Value, Short-term investments | 27,545 | 15,979
Fair Value, Long-term investments | 12,335 | 21,025
Fair Value, Total | 39,880 |
Agency bonds [Member] | Short-term investments [Member] |  |
Summary of available-for-sale investments |  |
Amortized Cost | 27,676 |
Gross Unrealized Gains | 19 |
Gross Unrealized Losses | (150) |
Fair Value, Short-term investments | 27,545 |
Agency bonds [Member] | Long-term investments [Member] |  |
Summary of available-for-sale investments |  |
Amortized Cost | 12,371 |
Gross Unrealized Gains | 35 |
Gross Unrealized Losses | (71) |
Sovereign bonds [Member] |  |
Summary of available-for-sale investments |  |
Fair Value, Short-term investments | 4,016 | 19,350
Fair Value, Long-term investments | 22,355 | 0
Fair Value, Total | 26,371 |
Sovereign bonds [Member] | Short-term investments [Member] |  |
Summary of available-for-sale investments |  |
Amortized Cost | 3,973 |
Gross Unrealized Gains | 43 |
Gross Unrealized Losses | 0 |
Fair Value, Short-term investments | 4,016 |
Sovereign bonds [Member] | Long-term investments [Member] |  |
Summary of available-for-sale investments |  |
Amortized Cost | 22,029 |
Gross Unrealized Gains | 326 |
Gross Unrealized Losses | 0 |
Covered bonds [Member] |  |
Summary of available-for-sale investments |  |
Fair Value, Short-term investments | 1,319 | 0
Fair Value, Long-term investments | 4,701 | 3,541
Fair Value, Total | 6,020 |
Covered bonds [Member] | Short-term investments [Member] |  |
Summary of available-for-sale investments |  |
Amortized Cost | 1,317 |
Gross Unrealized Gains | 2 |
Gross Unrealized Losses | 0 |
Fair Value, Short-term investments | 1,319 |
Covered bonds [Member] | Long-term investments [Member] |  |
Summary of available-for-sale investments |  |
Amortized Cost | 4,679 |
Gross Unrealized Gains | 22 |
Gross Unrealized Losses | $ 0 |

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