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Marketable Securities (Tables) | 9 Months Ended
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Sep. 30, 2015
Marketable Securities [Abstract] |
Amortized Cost And Fair Value Of Marketable Securities |
As of September 30, 2015 |  |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Corporate bonds |  | $ | 171,949 |  | $ | 39 |  | $ | (150) |  | $ | 171,838 |
Agency bonds |  |  | 18,108 |  |  | 3 |  |  | - |  |  | 18,111 |
U.S. government bonds |  |  | 10,174 |  |  | 6 |  |  | - |  |  | 10,180 |
Certificates of deposit |  |  | 3,400 |  |  | - |  |  | - |  |  | 3,400 |
Commercial paper |  |  | 1,999 |  |  | - |  |  | - |  |  | 1,999 |
International government bonds |  |  | 1,467 |  |  | - |  |  | (1) |  |  | 1,466 |
Municipal bonds |  |  | 1,400 |  |  | 5 |  |  | - |  |  | 1,405 |
Total marketable securities |  | $ | 208,497 |  | $ | 53 |  | $ | (151) |  | $ | 208,399 |
Contractual Maturities Of Marketable Securities |
As of September 30, 2015 |  |  | Amortized Cost |  |  | Fair Value |
Due in one year or less |  | $ | 144,120 |  | $ | 144,109 |
Due after one through two years |  |  | 64,377 |  |  | 64,290 |
|  | $ | 208,497 |  | $ | 208,399 |

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