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Investments in debt and equity securities and other investments (Tables) | 6 Months Ended
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Jun. 30, 2016
Investments Debt And Equity Securities [Abstract] |
Investments | The Company’s investments in securities consist of the following:
|  | June 30, 2016 |  |  | December 31, 2015 |
|  | Held to |  |  | Available |  |  |  |  |  |  | Held to |  |  | Available |  |  |  |  |
|  | maturity |  |  | for sale |  |  | Total |  |  | maturity |  |  | for sale |  |  | Total |
Certificates of deposit, commercial paper and money market funds due within one year |  | $ | 382,664 |  |  | $ | — |  |  | $ | 382,664 |  |  | $ | 406,884 |  |  | $ | — |  |  | $ | 406,884 |
Investments in mutual funds, debt securities and common stock |  |  | — |  |  |  | 50,056 |  |  |  | 50,056 |  |  | — |  |  |  | 33,482 |  |  |  | 33,482 |
|  | $ | 382,664 |  |  | $ | 50,056 |  |  | $ | 432,720 |  |  | $ | 406,884 |  |  | $ | 33,482 |  |  | $ | 440,366 |
Short-term investments |  | $ | 382,664 |  |  | $ | 11,502 |  |  | $ | 394,166 |  |  | $ | 406,884 |  |  | $ | 1,200 |  |  | $ | 408,084 |
Long-term investments |  |  | — |  |  |  | 38,554 |  |  |  | 38,554 |  |  |  | — |  |  |  | 32,282 |  |  |  | 32,282 |
|  | $ | 382,664 |  |  | $ | 50,056 |  |  | $ | 432,720 |  |  | $ | 406,884 |  |  | $ | 33,482 |  |  | $ | 440,366 |

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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26626-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2,12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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