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Fair Value of Financial Instruments (Details 2) (USD $) In Thousands, unless otherwise specified | 9 Months Ended |
--- | --- | ---
Sep. 30, 2013 Group | Dec. 31, 2012
Estimated fair values of available-for-sale securities with unrealized losses |  |
Number of maturity groups | 2 |
Investments by rolling maturity, Cost |  |
Due within 1 year | $ 33,401 | $ 30,790
Due in 1-2 years | 17,687 | 7,380
Total | 51,088 | 38,170
Investments by rolling maturity, Unrealized Gains |  |
Due within 1 year | 15 | 14
Due in 1-2 years | 5 | 3
Total | 20 | 17
Investments by rolling maturity, Unrealized Losses |  |
Due within 1 year | (7) | (6)
Due in 1-2 years | (21) |
Total | (28) | (6)
Investments by rolling maturity, Fair Value |  |
Due within 1 year | 33,409 | 30,798
Due in 1-2 years | 17,671 | 7,383
Total | 51,080 | 38,181
Short-term investments |  |
Estimated fair values of available-for-sale securities with unrealized losses |  |
Cost | 8,631 | 8,214
Unrealized Losses | (7) | (6)
Fair Value | 8,624 | 8,208
Investments by rolling maturity, Unrealized Gains |  |
Total | 15 | 14
Investments by rolling maturity, Unrealized Losses |  |
Total | (7) | (6)
Short-term investments | U.S. government debt securities |  |
Estimated fair values of available-for-sale securities with unrealized losses |  |
Cost | 2,041 | 2,546
Unrealized Losses | (3) | (2)
Fair Value | 2,038 | 2,544
Investments by rolling maturity, Unrealized Gains |  |
Total | 12 | 6
Investments by rolling maturity, Unrealized Losses |  |
Total | (3) | (2)
Short-term investments | Corporate notes |  |
Estimated fair values of available-for-sale securities with unrealized losses |  |
Cost | 3,270 | 5,668
Unrealized Losses | (1) | (4)
Fair Value | 3,269 | 5,664
Investments by rolling maturity, Unrealized Gains |  |
Total | 2 | 8
Investments by rolling maturity, Unrealized Losses |  |
Total | (1) | (4)
Short-term investments | Certificates of deposit |  |
Estimated fair values of available-for-sale securities with unrealized losses |  |
Cost | 3,320 |
Unrealized Losses | (3) |
Fair Value | 3,317 |
Investments by rolling maturity, Unrealized Gains |  |
Total | 1 |
Investments by rolling maturity, Unrealized Losses |  |
Total | (3) |
Long-term investments |  |
Estimated fair values of available-for-sale securities with unrealized losses |  |
Cost | 14,724 |
Unrealized Losses | (21) |
Fair Value | 14,703 |
Investments by rolling maturity, Unrealized Gains |  |
Total | 5 | 3
Investments by rolling maturity, Unrealized Losses |  |
Total | (21) |
Long-term investments | U.S. government debt securities |  |
Estimated fair values of available-for-sale securities with unrealized losses |  |
Cost | 3,758 |
Unrealized Losses | (1) |
Fair Value | 3,757 |
Investments by rolling maturity, Unrealized Gains |  |
Total | 3 | 2
Investments by rolling maturity, Unrealized Losses |  |
Total | (1) |
Long-term investments | Corporate notes |  |
Estimated fair values of available-for-sale securities with unrealized losses |  |
Cost | 9,286 |
Unrealized Losses | (13) |
Fair Value | 9,273 |
Investments by rolling maturity, Unrealized Gains |  |
Total | 1 | 1
Investments by rolling maturity, Unrealized Losses |  |
Total | (13) |
Long-term investments | Certificates of deposit |  |
Estimated fair values of available-for-sale securities with unrealized losses |  |
Cost | 1,680 |
Unrealized Losses | (7) |
Fair Value | 1,673 |
Investments by rolling maturity, Unrealized Gains |  |
Total | 1 |
Investments by rolling maturity, Unrealized Losses |  |
Total | $ (7) |

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