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Cash, Cash Equivalents, and Investments | 9 Months Ended
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Oct. 02, 2016
Cash and Cash Equivalents [Abstract] |
Cash, Cash Equivalents, and Investments | Cash, Cash Equivalents, and Investments Cash, cash equivalents, and investments consisted of the following (in thousands):
| October 2, 2016 |  | December 31, 2015
Cash | $ | 54,791 |  |  | $ | 45,951 |
Money market instruments | 6,354 |  |  | 6,024 |
Cash and cash equivalents | 61,145 |  |  | 51,975 |
Corporate bonds | 134,245 |  |  | 54,376 |
Asset-backed securities | 64,740 |  |  | 61,994 |
Euro liquidity fund | 49,586 |  |  | 47,730 |
Treasury bills | 36,728 |  |  | 109,360 |
Sovereign bonds | 28,720 |  |  | 21,440 |
Municipal bonds | 9,455 |  |  | 590 |
Agency bonds | 4,904 |  |  | 978 |
Short-term investments | 328,378 |  |  | 296,468 |
Corporate bonds | 163,534 |  |  | 176,575 |
Treasury bills | 70,579 |  |  | 44,437 |
Asset-backed securities | 38,782 |  |  | 24,582 |
Sovereign bonds | 24,384 |  |  | 13,503 |
Agency bonds | 18,648 |  |  | 8,180 |
Municipal bonds | — |  |  | 4,869 |
Limited partnership interest (accounted for using cost method) | — |  |  | 942 |
Long-term investments | 315,927 |  |  | 273,088 |
| $ | 705,450 |  |  | $ | 621,531 |
Corporate bonds consist of debt securities issued by both domestic and foreign companies; asset-backed securities consist of debt securities collateralized by pools of receivables or loans with credit enhancement; the Euro liquidity fund invests in a portfolio of investment-grade bonds; treasury bills consist of debt securities issued by the U.S. government; sovereign bonds consist of direct debt issued by foreign governments; municipal bonds consist of debt securities issued by state and local government entities; and agency bonds consist of domestic or foreign obligations of government agencies and government sponsored enterprises that have government backing. The Euro liquidity fund is denominated in Euros, and the remaining securities are denominated in U.S. Dollars. The following table summarizes the Company’s available-for-sale investments as of October 2, 2016 (in thousands):
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Short-term: |  |  |  |  |  |  |
Corporate bonds | $ | 134,232 |  |  | $ | 56 |  |  | $ | (43 | ) |  | $ | 134,245 |
Asset-backed securities | 64,696 |  |  | 49 |  |  | (5 | ) |  | 64,740 |
Euro liquidity fund | 49,256 |  |  | 330 |  |  | — |  |  | 49,586 |
Treasury bills | 36,704 |  |  | 27 |  |  | (3 | ) |  | 36,728 |
Sovereign bonds | 28,719 |  |  | 5 |  |  | (4 | ) |  | 28,720 |
Municipal bonds | 9,443 |  |  | 12 |  |  | — |  |  | 9,455 |
Agency bonds | 4,900 |  |  | 4 |  |  | — |  |  | 4,904 |
Long-term: |  |  |  |  |  |  |  |
Corporate bonds | 162,826 |  |  | 773 |  |  | (65 | ) |  | 163,534 |
Treasury bills | 70,535 |  |  | 60 |  |  | (16 | ) |  | 70,579 |
Asset-backed securities | 38,716 |  |  | 72 |  |  | (6 | ) |  | 38,782 |
Sovereign bonds | 24,362 |  |  | 31 |  |  | (9 | ) |  | 24,384 |
Agency bonds | 18,610 |  |  | 38 |  |  | — |  |  | 18,648 |
| $ | 642,999 |  |  | $ | 1,457 |  |  | $ | (151 | ) |  | $ | 644,305 |
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 2, 2016 (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
Corporate bonds | $ | 55,613 |  |  | $ | (50 | ) |  | $ | 24,991 |  |  | $ | (58 | ) |  | $ | 80,604 |  |  | $ | (108 | )
Treasury bills | 44,714 |  |  | (19 | ) |  | — |  |  | — |  |  | 44,714 |  |  | (19 | )
Asset-backed securities | 7,074 |  |  | (2 | ) |  | 13,580 |  |  | (9 | ) |  | 20,654 |  |  | (11 | )
Sovereign bonds | 16,414 |  |  | (11 | ) |  | 3,398 |  |  | (2 | ) |  | 19,812 |  |  | (13 | )
| $ | 123,815 |  |  | $ | (82 | ) |  | $ | 41,969 |  |  | $ | (69 | ) |  | $ | 165,784 |  |  | $ | (151 | )
As of October 2, 2016, the Company did not recognize any other-than-temporary impairment of these investments. In its evaluation, management considered the type of security, the credit rating of the security, the length of time the security has been in a loss position, the size of the loss position, the Company's intent and ability to hold the security to expected recovery of value, and other meaningful information. The Company does not intend to sell, and is unlikely to be required to sell, any of these available-for-sale investments before its effective maturity or market price recovery. The Company recorded gross realized gains and gross realized losses on the sale of debt securities totaling $55,000 and $0, respectively, during the three-month period ended October 2, 2016 and $26,000 and $7,000, respectively, during the three-month period ended October 4, 2015. The Company recorded gross realized gains and gross realized losses on the sale of debt securities totaling $280,000 and $97,000, respectively, during the nine-month period ended October 2, 2016 and $434,000 and $194,000, respectively, during the nine-month period ended October 4, 2015. These gains and losses are included in "Investment income" on the Consolidated Statement of Operations. Prior to the sale of these securities, unrealized gains and losses for these debt securities, net of tax, are recorded in shareholders’ equity as other comprehensive income (loss). The following table presents the effective maturity dates of the Company’s available-for-sale investments as of October 2, 2016 (in thousands):
| <1 year |  | 1-2 Years |  | 2-3 Years |  | 3-4 Years |  | 4-5 Years |  | Total
Corporate bonds | $ | 134,245 |  |  | $ | 71,977 |  |  | $ | 84,825 |  |  | $ | 2,212 |  |  | $ | 4,520 |  |  | $ | 297,779 |
Asset-backed securities | 64,740 |  |  | 20,212 |  |  | 8,722 |  |  | 9,689 |  |  | 159 |  |  | 103,522 |
Treasury bills | 36,728 |  |  | 70,579 |  |  | — |  |  | — |  |  | — |  |  | 107,307 |
Sovereign bonds | 28,720 |  |  | 19,749 |  |  | 4,635 |  |  | — |  |  | — |  |  | 53,104 |
Euro liquidity fund | 49,586 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 49,586 |
Agency bonds | 4,904 |  |  | 15,930 |  |  | 2,718 |  |  | — |  |  | — |  |  | 23,552 |
Municipal bonds | 9,455 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 9,455 |
| $ | 328,378 |  |  | $ | 198,447 |  |  | $ | 100,900 |  |  | $ | 11,901 |  |  | $ | 4,679 |  |  | $ | 644,305 |
The Company is a Limited Partner in Venrock Associates III, L.P. (Venrock), a venture capital fund. The Company has committed to a total investment in the limited partnership of up to $20,500,000, with an expiration date of December 31, 2017. The Company does not have the right to withdraw from the partnership prior to this date. As of October 2, 2016, the Company contributed $19,886,000 to the partnership. The remaining commitment of $614,000 can be called by Venrock at any time before December 31, 2017. Contributions and distributions are at the discretion of Venrock’s management. No contributions were made during the nine-month period ended October 2, 2016. The Company received a cash distribution of $1,492,000 during the third quarter of 2016, of which $942,000 was accounted for as a return of capital, reducing the carrying value of this investment to zero, with the remaining $550,000 recorded as investment income.

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