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Investments in debt and equity securities (Tables) | 6 Months Ended
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Jun. 30, 2017
Investments, Debt and Equity Securities [Abstract] |
Investments | The Company’s investments in these securities and certain other financial instruments consist of the following:
| June 30, 2017 |  | December 31, 2016
| Held to maturity |  | Available for sale |  | Total |  | Held to maturity |  | Available for sale |  | Total
Certificates of deposit, commercial paper and money market funds due within one year | $ | 210,236 |  |  | $ | — |  |  | $ | 210,236 |  |  | $ | 256,827 |  |  | $ | — |  |  | $ | 256,827 |
Investments in mutual funds and common stock | — |  |  | 53,209 |  |  | 53,209 |  |  | 50,000 |  |  | 47,404 |  |  | 97,404 |
Cash surrender value of life insurance policies | — |  |  | 62,684 |  |  | 62,684 |  |  | — |  |  | 59,646 |  |  | 59,646 |
| $ | 210,236 |  |  | $ | 115,893 |  |  | $ | 326,129 |  |  | $ | 306,827 |  |  | $ | 107,050 |  |  | $ | 413,877 |
Short-term investments | $ | 210,236 |  |  | $ | 1,200 |  |  | $ | 211,436 |  |  | $ | 306,827 |  |  | $ | 3,371 |  |  | $ | 310,198 |
Long-term investments | — |  |  | 114,693 |  |  | 114,693 |  |  | — |  |  | 103,679 |  |  | 103,679 |
| $ | 210,236 |  |  | $ | 115,893 |  |  | $ | 326,129 |  |  | $ | 306,827 |  |  | $ | 107,050 |  |  | $ | 413,877 |

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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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