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Cash, Cash Equivalents, and Investments (Tables) | 9 Months Ended
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Oct. 01, 2017
Cash and Cash Equivalents [Abstract] |
Components of Cash, Cash Equivalents, and Investments | Cash, cash equivalents, and investments consisted of the following (in thousands):
| October 1, 2017 |  | December 31, 2016
Cash | $ | 104,649 |  |  | $ | 77,307 |
Money market instruments | 6,700 |  |  | 2,334 |
Cash and cash equivalents | 111,349 |  |  | 79,641 |
Treasury bills | 70,184 |  |  | 67,175 |
Corporate bonds | 65,569 |  |  | 141,188 |
Euro liquidity fund | 52,312 |  |  | 46,499 |
Asset-backed securities | 47,840 |  |  | 69,614 |
Sovereign bonds | 20,945 |  |  | 7,298 |
Municipal bonds | 8,805 |  |  | 6,517 |
Agency bonds | 7,606 |  |  | 2,903 |
Short-term investments | 273,261 |  |  | 341,194 |
Corporate bonds | 245,940 |  |  | 169,952 |
Treasury bills | 63,602 |  |  | 92,280 |
Asset-backed securities | 59,069 |  |  | 26,946 |
Sovereign bonds | 8,026 |  |  | 23,585 |
Agency bonds | 5,639 |  |  | 10,339 |
Municipal bonds | 4,225 |  |  | 1,233 |
Long-term investments | 386,501 |  |  | 324,335 |
| $ | 771,111 |  |  | $ | 745,170 |
Summary of Available-for-Sale Investments | The following table summarizes the Company’s available-for-sale investments as of October 1, 2017 (in thousands):
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Short-term: |  |  |  |  |  |  |
Treasury bills | $ | 70,311 |  |  | $ | — |  |  | $ | (127 | ) |  | 70,184 |
Corporate bonds | 65,484 |  |  | 91 |  |  | (6 | ) |  | 65,569 |
Euro liquidity fund | 51,929 |  |  | 383 |  |  | — |  |  | 52,312 |
Asset-backed securities | 47,839 |  |  | 13 |  |  | (12 | ) |  | 47,840 |
Sovereign bonds | 20,974 |  |  | 5 |  |  | (34 | ) |  | 20,945 |
Municipal bonds | 8,805 |  |  | — |  |  | — |  |  | 8,805 |
Agency bonds | 7,600 |  |  | 6 |  |  | — |  |  | 7,606 |
Long-term: |  |  |  |  |  |  |
Corporate bonds | 245,046 |  |  | 1,013 |  |  | (119 | ) |  | 245,940 |
Treasury bills | 63,704 |  |  | — |  |  | (102 | ) |  | 63,602 |
Asset-backed securities | 59,038 |  |  | 76 |  |  | (45 | ) |  | 59,069 |
Sovereign bonds | 8,059 |  |  | 7 |  |  | (40 | ) |  | 8,026 |
Agency bonds | 5,630 |  |  | 9 |  |  | — |  |  | 5,639 |
Municipal bonds | 4,219 |  |  | 9 |  |  | (3 | ) |  | 4,225 |
| $ | 658,638 |  |  | $ | 1,612 |  |  | $ | (488 | ) |  | $ | 659,762 |
Gross Unrealized Losses and Fair Values for Available-for-Sale Investments | The following table summarizes the Company’s gross unrealized losses and fair values for available-for-sale investments in an unrealized loss position as of October 1, 2017 (in thousands):
| Unrealized Loss Position For: |  |
| Less than 12 Months |  | 12 Months or Greater |  | Total
| Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
Treasury bills | $ | 95,174 |  |  | $ | (150 | ) |  | $ | 33,627 |  |  | $ | (79 | ) |  | $ | 128,801 |  |  | $ | (229 | )
Asset-backed securities | 51,878 |  |  | (55 | ) |  | 8,770 |  |  | (2 | ) |  | 60,648 |  |  | (57 | )
Corporate bonds | 20,106 |  |  | (33 | ) |  | 15,154 |  |  | (92 | ) |  | 35,260 |  |  | (125 | )
Sovereign bonds | 2,495 |  |  | (5 | ) |  | 19,854 |  |  | (69 | ) |  | 22,349 |  |  | (74 | )
Municipal bonds | 1,356 |  |  | (3 | ) |  | — |  |  | — |  |  | 1,356 |  |  | (3 | )
| $ | 171,009 |  |  | $ | (246 | ) |  | $ | 77,405 |  |  | $ | (242 | ) |  | $ | 248,414 |  |  | $ | (488 | )
Effective Maturity Dates of Available-for-Sale Investments | The following table presents the effective maturity dates of the Company’s available-for-sale investments as of October 1, 2017 (in thousands):
| <1 year |  | 1-2 Years |  | 2-3 Years |  | 3-4 Years |  | 4-5 Years |  | 5-7 Years |  | Total
Corporate bonds | $ | 65,569 |  |  | $ | 109,918 |  |  | $ | 77,430 |  |  | $ | 17,223 |  |  | $ | 39,956 |  |  | $ | 1,413 |  |  | $ | 311,509 |
Treasury bills | 70,184 |  |  | 63,602 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 133,786 |
Asset-backed securities | 47,840 |  |  | 35,502 |  |  | 16,075 |  |  | — |  |  | 2,328 |  |  | 5,164 |  |  | 106,909 |
Euro liquidity fund | 52,312 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 52,312 |
Sovereign bonds | 20,945 |  |  | 4,599 |  |  | 3,427 |  |  | — |  |  | — |  |  | — |  |  | 28,971 |
Agency bonds | 7,606 |  |  | 2,719 |  |  | — |  |  | — |  |  | 2,920 |  |  | — |  |  | 13,245 |
Municipal bonds | 8,805 |  |  | 2,869 |  |  | 1,356 |  |  | — |  |  | — |  |  | — |  |  | 13,030 |
| $ | 273,261 |  |  | $ | 219,209 |  |  | $ | 98,288 |  |  | $ | 17,223 |  |  | $ | 45,204 |  |  | $ | 6,577 |  |  | $ | 659,762 |

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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: 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 + Details
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