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Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2016
Marketable Securities [Abstract] |
Amortized Cost And Fair Value Of Marketable Securities |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |
﻿As of December 31, 2016 |  |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Corporate bonds |  | $ | 130,833 |  | $ | 40 |  | $ | (102) |  | $ | 130,771 |
﻿Certificates of deposit |  |  | 40,400 |  |  | - |  |  | - |  |  | 40,400 |
﻿Asset backed securities |  |  | 27,290 |  |  | 25 |  |  | - |  |  | 27,315 |
﻿Commercial paper |  |  | 20,228 |  |  | - |  |  | - |  |  | 20,228 |
﻿U.S. government bonds |  |  | 12,244 |  |  | 1 |  |  | (14) |  |  | 12,231 |
﻿Agency bonds |  |  | 4,600 |  |  | 4 |  |  | - |  |  | 4,604 |
﻿Municipal bonds |  |  | 1,400 |  |  | - |  |  | - |  |  | 1,400 |
﻿Total marketable securities |  | $ | 236,995 |  | $ | 70 |  | $ | (116) |  | $ | 236,949 |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |
﻿As of December 31, 2015 |  |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Corporate bonds |  | $ | 177,810 |  | $ | 24 |  | $ | (221) |  | $ | 177,613 |
﻿U.S. government bonds |  |  | 12,881 |  |  | - |  |  | (10) |  |  | 12,871 |
﻿Agency bonds |  |  | 12,068 |  |  | - |  |  | (3) |  |  | 12,065 |
﻿Certificates of deposit |  |  | 3,500 |  |  | - |  |  | - |  |  | 3,500 |
﻿Commercial paper |  |  | 3,491 |  |  | - |  |  | - |  |  | 3,491 |
﻿International government bonds |  |  | 1,462 |  |  | - |  |  | (3) |  |  | 1,459 |
﻿Municipal bonds |  |  | 1,400 |  |  | - |  |  | (1) |  |  | 1,399 |
﻿Treasury bill |  |  | 1,192 |  |  | 1 |  |  | - |  |  | 1,193 |
﻿Total marketable securities |  | $ | 213,804 |  | $ | 25 |  | $ | (238) |  | $ | 213,591 |
﻿
Contractual Maturities Of Marketable Securities |
﻿ |  |  |  |  |  |  |
﻿As of December 31, 2016 |  |  | Amortized Cost |  |  | Fair Value |
﻿ |  |  |  |  |  |  |
﻿Due in one year or less |  | $ | 169,044 |  | $ | 169,002 |
﻿Due after one through two years |  |  | 67,951 |  |  | 67,947 |
﻿ |  | $ | 236,995 |  | $ | 236,949 |
﻿

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