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Derivatives and Fair Value of Financial Instruments (Details) (USD $) | 9 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Sep. 28, 2013 | Sep. 28, 2013 Commodities | Dec. 31, 2012 Commodities | Sep. 28, 2013 Money market funds | Dec. 31, 2012 Money market funds | Sep. 28, 2013 Corporate bonds | Dec. 31, 2012 Corporate bonds | Sep. 28, 2013 U.S. Government agency securities | Dec. 31, 2012 U.S. Government agency securities | Sep. 28, 2013 Emerging markets debt mutual fund | Dec. 31, 2012 Emerging markets debt mutual fund | Sep. 28, 2013 Collateralized mortgage obligations | Dec. 31, 2012 Collateralized mortgage obligations | Sep. 28, 2013 Asset backed debt securities | Dec. 31, 2012 Asset backed debt securities | Sep. 28, 2013 U.S. Treasury securities | Dec. 31, 2012 U.S. Treasury securities | Sep. 28, 2013 High yield trading debt securities | Dec. 31, 2012 High yield trading debt securities | Sep. 28, 2013 Emerging markets trading debt mutual fund | Dec. 31, 2012 Emerging markets trading debt mutual fund | Sep. 28, 2013 Emerging markets trading debt securities | Dec. 31, 2012 Emerging markets trading debt securities | Sep. 28, 2013 Recurring basis Balance at period end | Dec. 31, 2012 Recurring basis Balance at period end | Sep. 28, 2013 Recurring basis Balance at period end Commodities | Dec. 31, 2012 Recurring basis Balance at period end Commodities | Sep. 28, 2013 Recurring basis Balance at period end Interest rate swaps | Dec. 31, 2012 Recurring basis Balance at period end Interest rate swaps | Sep. 28, 2013 Recurring basis Balance at period end Foreign currencies | Dec. 31, 2012 Recurring basis Balance at period end Foreign currencies | Sep. 28, 2013 Recurring basis Balance at period end Money market funds Short-term investments | Dec. 31, 2012 Recurring basis Balance at period end Money market funds Short-term investments | Sep. 28, 2013 Recurring basis Balance at period end Money market funds Other current assets | Dec. 31, 2012 Recurring basis Balance at period end Money market funds Other current assets | Sep. 28, 2013 Recurring basis Balance at period end Corporate bonds Short-term investments | Dec. 31, 2012 Recurring basis Balance at period end Corporate bonds Short-term investments | Sep. 28, 2013 Recurring basis Balance at period end Corporate bonds Other current assets | Dec. 31, 2012 Recurring basis Balance at period end Corporate bonds Other current assets | Sep. 28, 2013 Recurring basis Balance at period end U.S. Government agency securities Short-term investments | Dec. 31, 2012 Recurring basis Balance at period end U.S. Government agency securities Short-term investments | Sep. 28, 2013 Recurring basis Balance at period end U.S. Government agency securities Other current assets | Dec. 31, 2012 Recurring basis Balance at period end U.S. Government agency securities Other current assets | Sep. 28, 2013 Recurring basis Balance at period end Emerging markets debt mutual fund Short-term investments | Dec. 31, 2012 Recurring basis Balance at period end Emerging markets debt mutual fund Short-term investments | Sep. 28, 2013 Recurring basis Balance at period end Collateralized mortgage obligations Short-term investments | Dec. 31, 2012 Recurring basis Balance at period end Collateralized mortgage obligations Short-term investments | Sep. 28, 2013 Recurring basis Balance at period end Asset backed debt securities Short-term investments | Dec. 31, 2012 Recurring basis Balance at period end Asset backed debt securities Short-term investments | Sep. 28, 2013 Recurring basis Balance at period end U.S. Treasury securities Short-term investments | Dec. 31, 2012 Recurring basis Balance at period end U.S. Treasury securities Short-term investments | Sep. 28, 2013 Recurring basis Balance at period end U.S. Treasury securities Other current assets | Dec. 31, 2012 Recurring basis Balance at period end U.S. Treasury securities Other current assets | Sep. 28, 2013 Recurring basis Balance at period end High yield trading debt securities Short-term investments | Dec. 31, 2012 Recurring basis Balance at period end High yield trading debt securities Short-term investments | Sep. 28, 2013 Recurring basis Balance at period end Emerging markets trading debt mutual fund Short-term investments | Dec. 31, 2012 Recurring basis Balance at period end Emerging markets trading debt mutual fund Short-term investments | Sep. 28, 2013 Recurring basis Balance at period end Emerging markets trading debt securities Short-term investments | Dec. 31, 2012 Recurring basis Balance at period end Emerging markets trading debt securities Short-term investments | Sep. 28, 2013 Recurring basis Balance at period end Other trading investments Short-term investments | Dec. 31, 2012 Recurring basis Balance at period end Other trading investments Short-term investments | Sep. 28, 2013 Recurring basis Balance at period end Domestic equity securities Other current assets | Dec. 31, 2012 Recurring basis Balance at period end Domestic equity securities Other current assets | Sep. 28, 2013 Recurring basis Balance at period end Foreign equity securities Other current assets | Dec. 31, 2012 Recurring basis Balance at period end Foreign equity securities Other current assets | Sep. 28, 2013 Recurring basis Balance at period end Fixed income mutual funds Other current assets | Dec. 31, 2012 Recurring basis Balance at period end Fixed income mutual funds Other current assets | Sep. 28, 2013 Recurring basis Balance at period end Other Other current assets | Dec. 31, 2012 Recurring basis Balance at period end Other Other current assets | Sep. 28, 2013 Recurring basis Level 1 | Dec. 31, 2012 Recurring basis Level 1 | Sep. 28, 2013 Recurring basis Level 1 Commodities | Dec. 31, 2012 Recurring basis Level 1 Commodities | Sep. 28, 2013 Recurring basis Level 1 Money market funds Short-term investments | Dec. 31, 2012 Recurring basis Level 1 Money market funds Short-term investments | Sep. 28, 2013 Recurring basis Level 1 Money market funds Other current assets | Dec. 31, 2012 Recurring basis Level 1 Money market funds Other current assets | Sep. 28, 2013 Recurring basis Level 1 Emerging markets debt mutual fund Short-term investments | Dec. 31, 2012 Recurring basis Level 1 Emerging markets debt mutual fund Short-term investments | Sep. 28, 2013 Recurring basis Level 1 Emerging markets trading debt mutual fund Short-term investments | Dec. 31, 2012 Recurring basis Level 1 Emerging markets trading debt mutual fund Short-term investments | Sep. 28, 2013 Recurring basis Level 1 Other trading investments Short-term investments | Dec. 31, 2012 Recurring basis Level 1 Other trading investments Short-term investments | Sep. 28, 2013 Recurring basis Level 1 Domestic equity securities Other current assets | Dec. 31, 2012 Recurring basis Level 1 Domestic equity securities Other current assets | Sep. 28, 2013 Recurring basis Level 1 Foreign equity securities Other current assets | Dec. 31, 2012 Recurring basis Level 1 Foreign equity securities Other current assets | Sep. 28, 2013 Recurring basis Level 1 Fixed income mutual funds Other current assets | Dec. 31, 2012 Recurring basis Level 1 Fixed income mutual funds Other current assets | Sep. 28, 2013 Recurring basis Level 1 Other Other current assets | Dec. 31, 2012 Recurring basis Level 1 Other Other current assets | Sep. 28, 2013 Recurring basis Level 2 | Dec. 31, 2012 Recurring basis Level 2 | Dec. 31, 2012 Recurring basis Level 2 Commodities | Sep. 28, 2013 Recurring basis Level 2 Interest rate swaps | Dec. 31, 2012 Recurring basis Level 2 Interest rate swaps | Sep. 28, 2013 Recurring basis Level 2 Foreign currencies | Dec. 31, 2012 Recurring basis Level 2 Foreign currencies | Sep. 28, 2013 Recurring basis Level 2 Corporate bonds Short-term investments | Dec. 31, 2012 Recurring basis Level 2 Corporate bonds Short-term investments | Sep. 28, 2013 Recurring basis Level 2 Corporate bonds Other current assets | Dec. 31, 2012 Recurring basis Level 2 Corporate bonds Other current assets | Sep. 28, 2013 Recurring basis Level 2 U.S. Government agency securities Short-term investments | Dec. 31, 2012 Recurring basis Level 2 U.S. Government agency securities Short-term investments | Sep. 28, 2013 Recurring basis Level 2 U.S. Government agency securities Other current assets | Dec. 31, 2012 Recurring basis Level 2 U.S. Government agency securities Other current assets | Sep. 28, 2013 Recurring basis Level 2 Collateralized mortgage obligations Short-term investments | Dec. 31, 2012 Recurring basis Level 2 Collateralized mortgage obligations Short-term investments | Sep. 28, 2013 Recurring basis Level 2 Asset backed debt securities Short-term investments | Dec. 31, 2012 Recurring basis Level 2 Asset backed debt securities Short-term investments | Sep. 28, 2013 Recurring basis Level 2 U.S. Treasury securities Short-term investments | Dec. 31, 2012 Recurring basis Level 2 U.S. Treasury securities Short-term investments | Sep. 28, 2013 Recurring basis Level 2 U.S. Treasury securities Other current assets | Dec. 31, 2012 Recurring basis Level 2 U.S. Treasury securities Other current assets | Sep. 28, 2013 Recurring basis Level 2 High yield trading debt securities Short-term investments | Dec. 31, 2012 Recurring basis Level 2 High yield trading debt securities Short-term investments | Sep. 28, 2013 Recurring basis Level 2 Emerging markets trading debt securities Short-term investments | Dec. 31, 2012 Recurring basis Level 2 Emerging markets trading debt securities Short-term investments | Sep. 28, 2013 Recurring basis Level 2 Other trading investments Short-term investments | Dec. 31, 2012 Recurring basis Level 2 Other trading investments Short-term investments | Sep. 28, 2013 Recurring basis Level 2 Foreign equity securities Other current assets | Dec. 31, 2012 Recurring basis Level 2 Foreign equity securities Other current assets | Sep. 28, 2013 Recurring basis Level 2 Other Other current assets | Dec. 31, 2012 Recurring basis Level 2 Other Other current assets
Derivatives and Fair Value of Financial Instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transfers that occurred into or out of level 1 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transfers that occurred into or out of level 2 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transfers that occurred into or out of level 3 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities |  |  |  | 78,435,000 | 126,537,000 | 69,038,000 | 69,214,000 | 20,412,000 | 23,775,000 | 17,253,000 | 18,734,000 | 15,007,000 | 15,162,000 | 8,967,000 | 12,238,000 | 5,237,000 | 17,169,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 78,435,000 | 126,537,000 |  |  | 69,038,000 | 69,214,000 |  |  | 20,412,000 | 23,775,000 |  |  | 17,253,000 | 18,734,000 | 15,007,000 | 15,162,000 | 8,967,000 | 12,238,000 | 5,237,000 | 17,169,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 78,435,000 | 126,537,000 |  |  | 17,253,000 | 18,734,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 69,038,000 | 69,214,000 |  |  | 20,412,000 | 23,775,000 |  |  | 15,007,000 | 15,162,000 | 8,967,000 | 12,238,000 | 5,237,000 | 17,169,000 |  |  |  |  |  |  |  |  |  |  |  |
Trading securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,195,000 | 23,406,000 | 2,900,000 | 3,237,000 | 1,535,000 | 2,600,000 |  |  |  |  |  |  |  |  |  |  | 2,046,000 | 3,157,000 |  |  | 81,000 | 60,000 |  |  | 958,000 | 2,117,000 |  |  |  |  |  |  |  |  | 1,506,000 | 1,567,000 | 25,195,000 | 23,406,000 | 2,900,000 | 3,237,000 | 1,535,000 | 2,600,000 | 1,016,000 | 1,307,000 | 22,881,000 | 15,864,000 | 9,380,000 | 6,831,000 | 5,954,000 | 7,153,000 | 313,000 | 239,000 |  |  |  |  |  |  | 2,046,000 | 3,157,000 |  |  | 2,900,000 | 3,237,000 | 507,000 | 822,000 | 22,881,000 | 15,864,000 | 5,614,000 | 4,218,000 | 5,954,000 | 7,153,000 | 271,000 | 187,000 |  |  |  |  |  |  |  |  |  | 81,000 | 60,000 |  |  | 958,000 | 2,117,000 |  |  |  |  |  |  | 1,506,000 | 1,567,000 | 25,195,000 | 23,406,000 | 1,535,000 | 2,600,000 | 509,000 | 485,000 | 3,766,000 | 2,613,000 | 42,000 | 52,000
Derivatives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,062,000 | 6,916,000 |  |  | 4,088,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,062,000 | 6,699,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 217,000 |  |  | 4,088,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Margin account |  | 30,382,000 | 14,063,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30,382,000 | 14,063,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative assets and liabilities, net basis |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,562,000 | 13,867,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 294,264,000 | 357,283,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 137,923,000 | 186,608,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 156,341,000 | 170,675,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,882,000 | 7,112,000 | 5,318,000 | 9,810,000 | 92,000 | 4,157,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,882,000 | 7,112,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,318,000 | 9,810,000 | 92,000 | 4,157,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 23,292,000 | $ 21,079,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 17,882,000 | $ 7,112,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,410,000 | $ 13,967,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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