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Marketable Securities | 12 Months Ended
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Dec. 31, 2016
Marketable Securities [Abstract] |
Marketable Securities | NOTE 5. MARKETABLE SECURITIES ﻿ During the year ended December 31, 2016, we purchased marketable debt securities, which are classified as available-for-sale and carried at fair value in the accompanying consolidated balance sheets on a trade date basis. We have classified our investments with maturities beyond one year as short-term, based on their highly liquid nature and because such marketable securities represent the investment of cash that is available for current operations. Unrealized holding gains and losses are deferred within accumulated other comprehensive income (“AOCI”), net of applicable taxes, except for when an impairment is determined to be other-than-temporary or the security is divested prior to maturity. Within the accompanying consolidated statements of operations, interest earned and amortization of premiums or discounts on marketable securities are included in interest income, realized gains and losses on the sale of our marketable securities are included in other income. ﻿ The amortized cost and fair value of marketable securities were as follows (in thousands): ﻿
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |
﻿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 |
﻿ No marketable securities have been in a continuous unrealized loss position for more than twelve months. Our portfolio of marketable securities had an average AA- credit rating as of December 31, 2016. There were no marketable securities that we consider to be other-than-temporarily impaired as of December 31, 2016. Our investment strategy is to buy short-duration marketable securities with a high credit rating. Some of our marketable securities have call features that can effectively shorten the lifespan from the contractual maturity date. We use effective maturity date to measure the duration of the marketable securities. ﻿ Remaining effective maturities of marketable securities were as follows (in thousands): ﻿
﻿ |  |  |  |  |  |  |
﻿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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- 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=73527792&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=73527792&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=73527792&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=73527792&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=73527792&loc=d3e27405-111563 + Details
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