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Cash and Investments (Tables) | 3 Months Ended
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Mar. 30, 2018
Investments, Debt and Equity Securities [Abstract] |
Reconciliation of Cash, Cash Equivalents, and Restricted Cash | A reconciliation of Cash, cash equivalents, and restricted cash reported within the Condensed Consolidated Balance Sheets to the amount reported within the Condensed Consolidated Statements of Cash Flows was as follows (in thousands):
| March 31, 2018 |  | December 31, 2017 |  | March 31, 2017 |  | December 31, 2016
Cash and cash equivalents | $ | 232,331 |  |  | $ | 183,164 |  |  | $ | 183,179 |  |  | $ | 151,686 |
Restricted cash included in short-term restricted cash and investments | 504 |  |  | 504 |  |  | — |  |  | — |
Restricted cash included in long-term restricted cash and investments | 1,500 |  |  | 4,646 |  |  | 4,150 |  |  | 4,150 |
Cash, cash equivalents, and restricted cash as reported within the Condensed Consolidated Statements of Cash Flows | $ | 234,335 |  |  | $ | 188,314 |  |  | $ | 187,329 |  |  | $ | 155,836 |
Investments by Security Type | Investments by security type were as follows; the amounts presented exclude cash, but include investments classified as cash equivalents (in thousands):
| March 31, 2018
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Money market funds | $ | 55,241 |  |  | $ | — |  |  | $ | — |  |  | $ | 55,241 |
Commercial paper | 237,067 |  |  | — |  |  | — |  |  | 237,067 |
Corporate bonds | 191,361 |  |  | 13 |  |  | (843 | ) |  | 190,531 |
U.S. Treasury and government sponsored enterprises | 21,490 |  |  | — |  |  | (57 | ) |  | 21,433 |
Total | $ | 505,159 |  |  | $ | 13 |  |  | $ | (900 | ) |  | $ | 504,272 |
| December 31, 2017
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Money market funds | $ | 45,478 |  |  | $ | — |  |  | $ | — |  |  | $ | 45,478 |
Commercial paper | 199,647 |  |  | — |  |  | — |  |  | 199,647 |
Corporate bonds | 179,336 |  |  | 18 |  |  | (332 | ) |  | 179,022 |
U.S. Treasury and government sponsored enterprises | 16,295 |  |  | — |  |  | (32 | ) |  | 16,263 |
Total | $ | 440,756 |  |  | $ | 18 |  |  | $ | (364 | ) |  | $ | 440,410 |
Fair Value and Gross Unrealized Losses of Investments Available-for-Sale in an Unrealized Loss Position | The fair value of and gross unrealized losses on investments available-for-sale in an unrealized loss position were as follows (in thousands):
| March 31, 2018
| In an Unrealized Loss Position Less than 12 Months |  | In an Unrealized Loss Position 12 Months or Greater |  | Total
| Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
Corporate bonds | $ | 167,459 |  |  | $ | (822 | ) |  | $ | 9,077 |  |  | $ | (21 | ) |  | $ | 176,536 |  |  | $ | (843 | )
U.S. Treasury and government sponsored enterprises | 17,000 |  |  | (52 | ) |  | 2,655 |  |  | (5 | ) |  | 19,655 |  |  | (57 | )
Total | $ | 184,459 |  |  | $ | (874 | ) |  | $ | 11,732 |  |  | $ | (26 | ) |  | $ | 196,191 |  |  | $ | (900 | )
| December 31, 2017
| In an Unrealized Loss Position Less than 12 Months |  | In an Unrealized Loss Position 12 Months or Greater |  | Total
| Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
Corporate bonds | $ | 140,746 |  |  | $ | (296 | ) |  | $ | 20,047 |  |  | $ | (36 | ) |  | $ | 160,793 |  |  | $ | (332 | )
U.S. Treasury and government sponsored enterprises | 13,611 |  |  | (23 | ) |  | 2,651 |  |  | (9 | ) |  | 16,262 |  |  | (32 | )
Total | $ | 154,357 |  |  | $ | (319 | ) |  | $ | 22,698 |  |  | $ | (45 | ) |  | $ | 177,055 |  |  | $ | (364 | )
Fair Value of Cash Equivalents and Investments by Contractual Maturity | The fair value of cash equivalents and investments by contractual maturity were as follows (in thousands):
| December 31,
| 2018 |  | 2017
Maturing in one year or less | $ | 410,062 |  |  | $ | 377,155 |
Maturing after one year through five years | 94,210 |  |  | 63,255 |
Total | $ | 504,272 |  |  | $ | 440,410 |

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- Definition Tabular disclosure of fair value of investments in debt and equity securities in an unrealized loss position categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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