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Investments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Oct. 03, 2015 | Sep. 27, 2014 | Oct. 03, 2015 | Sep. 27, 2014 | Dec. 31, 2014
Investments |  |  |  |  |
Total short term investments, amortized cost | $ 712,678 |  | $ 712,678 |  | $ 497,230
Total short term investments, fair value | 689,443 |  | 689,443 |  | 490,566
Unrealized losses related to trading securities | 22,377 | $ 3,774 | 20,902 | $ 3,149 |
Available-for-sale securities. |  |  |  |  |
Investments |  |  |  |  |
Amortized Cost | 100,648 |  | 100,648 |  | 167,049
Fair Value | 100,648 |  | 100,648 |  | 167,096
Money market funds |  |  |  |  |
Investments |  |  |  |  |
Amortized Cost | 100,648 |  | 100,648 |  | 142,432
Fair Value | 100,648 |  | 100,648 |  | 142,432
Corporate bonds |  |  |  |  |
Investments |  |  |  |  |
Amortized Cost |  |  |  |  | 11,000
Fair Value |  |  |  |  | 11,015
U.S. Government agency securities |  |  |  |  |
Investments |  |  |  |  |
Amortized Cost |  |  |  |  | 9,684
Fair Value |  |  |  |  | 9,666
Other available-for-sale securities |  |  |  |  |
Investments |  |  |  |  |
Amortized Cost |  |  |  |  | 3,933
Fair Value |  |  |  |  | 3,983
Trading securities. |  |  |  |  |
Investments |  |  |  |  |
Amortized Cost | 612,030 |  | 612,030 |  | 330,181
Fair Value | 588,795 |  | 588,795 |  | 323,470
Domestic equity securities |  |  |  |  |
Investments |  |  |  |  |
Amortized Cost | 167,770 |  | 167,770 |  |
Fair Value | 158,815 |  | 158,815 |  |
High yield trading debt securities |  |  |  |  |
Investments |  |  |  |  |
Amortized Cost | 125,347 |  | 125,347 |  | 187,491
Fair Value | 122,178 |  | 122,178 |  | 181,483
Domestic equity mutual fund |  |  |  |  |
Investments |  |  |  |  |
Amortized Cost | 86,309 |  | 86,309 |  | 83,809
Fair Value | 80,525 |  | 80,525 |  | 82,542
Domestic equity ETF |  |  |  |  |
Investments |  |  |  |  |
Amortized Cost | 78,925 |  | 78,925 |  | 31,307
Fair Value | 77,443 |  | 77,443 |  | 32,651
Foreign equity securities |  |  |  |  |
Investments |  |  |  |  |
Amortized Cost | 78,876 |  | 78,876 |  |
Fair Value | 76,669 |  | 76,669 |  |
Money market funds held in trading accounts |  |  |  |  |
Investments |  |  |  |  |
Amortized Cost | 40,152 |  | 40,152 |  | 21,401
Fair Value | 40,152 |  | 40,152 |  | 21,401
Foreign equity mutual fund |  |  |  |  |
Investments |  |  |  |  |
Amortized Cost | 20,000 |  | 20,000 |  |
Fair Value | 19,831 |  | 19,831 |  |
Collateralized loan obligation |  |  |  |  |
Investments |  |  |  |  |
Amortized Cost | 10,000 |  | 10,000 |  |
Fair Value | 9,791 |  | 9,791 |  |
Other trading securities |  |  |  |  |
Investments |  |  |  |  |
Amortized Cost | 4,651 |  | 4,651 |  | 6,173
Fair Value | 3,391 |  | 3,391 |  | $ 5,393
Denominated in British pounds | Money market funds |  |  |  |  |
Investments |  |  |  |  |
Fair Value | 970 |  | 970 |  |
Denominated in Canadian dollars | Money market funds |  |  |  |  |
Investments |  |  |  |  |
Fair Value | $ 147 |  | $ 147 |  |

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