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Fair Value of Financial Instruments (Details 2) (USD $) In Thousands, unless otherwise specified | 6 Months Ended |
--- | --- | ---
Jun. 30, 2013 Item | 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 | $ 31,817 | $ 30,790
Due in 1-2 years | 19,006 | 7,380
Total | 50,823 | 38,170
Investments by rolling maturity, Unrealized Gains |  |
Due within 1 year | 9 | 14
Due in 1-2 years | 6 | 3
Total | 15 | 17
Investments by rolling maturity, Unrealized Losses |  |
Due within 1 year | (13) | (6)
Due in 1-2 years | (61) |
Total | (74) | (6)
Investments by rolling maturity, Fair Value |  |
Due within 1 year | 31,813 | 30,798
Due in 1-2 years | 18,951 | 7,383
Total | 50,764 | 38,181
Short-term investments |  |
Estimated fair values of available-for-sale securities with unrealized losses |  |
Cost | 12,554 | 8,214
Unrealized Losses | (13) | (6)
Fair Value | 12,541 | 8,208
Investments by rolling maturity, Unrealized Gains |  |
Total | 9 | 14
Investments by rolling maturity, Unrealized Losses |  |
Total | (13) | (6)
Short-term investments | U.S. government debt securities |  |
Estimated fair values of available-for-sale securities with unrealized losses |  |
Cost | 3,804 | 2,546
Unrealized Losses | (2) | (2)
Fair Value | 3,802 | 2,544
Investments by rolling maturity, Unrealized Gains |  |
Total | 6 | 6
Investments by rolling maturity, Unrealized Losses |  |
Total | (2) | (2)
Short-term investments | Corporate notes |  |
Estimated fair values of available-for-sale securities with unrealized losses |  |
Cost | 5,870 | 5,668
Unrealized Losses | (6) | (4)
Fair Value | 5,864 | 5,664
Investments by rolling maturity, Unrealized Gains |  |
Total | 2 | 8
Investments by rolling maturity, Unrealized Losses |  |
Total | (6) | (4)
Short-term investments | Certificates of deposit |  |
Estimated fair values of available-for-sale securities with unrealized losses |  |
Cost | 2,880 |
Unrealized Losses | (5) |
Fair Value | 2,875 |
Investments by rolling maturity, Unrealized Gains |  |
Total | 1 |
Investments by rolling maturity, Unrealized Losses |  |
Total | (5) |
Long-term investments |  |
Estimated fair values of available-for-sale securities with unrealized losses |  |
Cost | 15,530 |
Unrealized Losses | (61) |
Fair Value | 15,469 |
Investments by rolling maturity, Unrealized Gains |  |
Total | 6 | 3
Investments by rolling maturity, Unrealized Losses |  |
Total | (61) |
Long-term investments | U.S. government debt securities |  |
Estimated fair values of available-for-sale securities with unrealized losses |  |
Cost | 6,020 |
Unrealized Losses | (10) |
Fair Value | 6,010 |
Investments by rolling maturity, Unrealized Gains |  |
Total | 5 | 2
Investments by rolling maturity, Unrealized Losses |  |
Total | (10) |
Long-term investments | Corporate notes |  |
Estimated fair values of available-for-sale securities with unrealized losses |  |
Cost | 8,310 |
Unrealized Losses | (46) |
Fair Value | 8,264 |
Investments by rolling maturity, Unrealized Gains |  |
Total |  | 1
Investments by rolling maturity, Unrealized Losses |  |
Total | (46) |
Long-term investments | Certificates of deposit |  |
Estimated fair values of available-for-sale securities with unrealized losses |  |
Cost | 1,200 |
Unrealized Losses | (5) |
Fair Value | 1,195 |
Investments by rolling maturity, Unrealized Gains |  |
Total | 1 |
Investments by rolling maturity, Unrealized Losses |  |
Total | $ (5) |

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