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Marketable Securities | 6 Months Ended
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Jun. 30, 2016
Marketable Securities [Abstract] |
Marketable Securities | Note 4. marketable securities ﻿ The amortized cost and fair value of marketable securities were as follows (in thousands): ﻿
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |
﻿As of June 30, 2016 |  |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Corporate bonds |  | $ | 144,591 |  | $ | 131 |  | $ | (45) |  | $ | 144,677 |
﻿Asset backed securities |  |  | 28,263 |  |  | 70 |  |  | - |  |  | 28,333 |
﻿Certificates of deposit |  |  | 20,800 |  |  | - |  |  | - |  |  | 20,800 |
﻿Commercial paper |  |  | 18,224 |  |  | - |  |  | - |  |  | 18,224 |
﻿U.S. government bonds |  |  | 12,601 |  |  | 21 |  |  | - |  |  | 12,622 |
﻿Agency bonds |  |  | 2,400 |  |  | 1 |  |  | - |  |  | 2,401 |
﻿Municipal bonds |  |  | 1,400 |  |  | 5 |  |  | - |  |  | 1,405 |
﻿International government bonds |  |  | 601 |  |  | - |  |  | - |  |  | 601 |
﻿Total marketable securities |  | $ | 228,880 |  | $ | 228 |  | $ | (45) |  | $ | 229,063 |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |
﻿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 |
﻿ As of June 30, 2016, unrealized losses on marketable securities that have been in a continuous loss position for more than twelve months were not material. Our portfolio of marketable securities had an average AA- credit rating as of June 30, 2016. There were no marketable securities that we consider to be other-than-temporarily impaired as of June 30, 2016. ﻿ Remaining contractual maturities of marketable securities were as follows (in thousands): ﻿ ﻿
﻿ |  |  |  |  |  |  |
﻿As of June 30, 2016 |  |  | Amortized Cost |  |  | Fair Value |
﻿ |  |  |  |  |  |  |
﻿Due in one year or less |  | $ | 192,177 |  | $ | 192,284 |
﻿Due after one year through three years |  |  | 36,703 |  |  | 36,779 |
﻿ |  | $ | 228,880 |  | $ | 229,063 |
﻿

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -Glossary Debt Security -URI http://asc.fasb.org/extlink&oid=6509901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -Glossary Equity Security -URI http://asc.fasb.org/extlink&oid=6511694 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27405-111563 + Details
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