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Marketable Securities (Tables) | 6 Months Ended
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Jun. 30, 2015
Marketable Securities [Abstract] |
Amortized Cost And Fair Value Of Marketable Securities |
As of June 30, 2015 |  |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Corporate bonds |  | $ | 143,233 |  | $ | 12 |  | $ | (157) |  | $ | 143,088 |
Agency bonds |  |  | 18,150 |  |  | 1 |  |  | - |  |  | 18,151 |
U.S. government bonds |  |  | 10,211 |  |  | 4 |  |  | - |  |  | 10,215 |
Commercial paper |  |  | 3,747 |  |  | - |  |  | - |  |  | 3,747 |
International government bond |  |  | 2,270 |  |  | - |  |  | (3) |  |  | 2,267 |
Certificate of deposit |  |  | 2,000 |  |  | - |  |  | - |  |  | 2,000 |
Municipal bond |  |  | 1,400 |  |  | 2 |  |  | - |  |  | 1,402 |
Total marketable securities |  | $ | 181,011 |  | $ | 19 |  | $ | (160) |  | $ | 180,870 |
Contractual Maturities Of Marketable Securities |
As of June 30, 2015 |  |  | Amortized Cost |  |  | Fair Value |
Due in one year or less |  | $ | 114,841 |  | $ | 114,783 |
Due after one through two years |  |  | 66,170 |  |  | 66,087 |
|  | $ | 181,011 |  | $ | 180,870 |

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