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Derivatives and Fair Value of Financial Instruments (Details) (USD $) | 3 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Mar. 29, 2014 | Mar. 29, 2014 Commodities | Dec. 31, 2013 Commodities | Mar. 29, 2014 Money market funds | Dec. 31, 2013 Money market funds | Mar. 29, 2014 Corporate bonds | Dec. 31, 2013 Corporate bonds | Mar. 29, 2014 U.S. Government agency securities | Dec. 31, 2013 U.S. Government agency securities | Mar. 29, 2014 Asset backed debt securities | Dec. 31, 2013 Asset backed debt securities | Mar. 29, 2014 Collateralized mortgage obligations | Dec. 31, 2013 Collateralized mortgage obligations | Mar. 29, 2014 U.S. Treasury securities | Dec. 31, 2013 U.S. Treasury securities | Dec. 31, 2013 Emerging markets debt mutual fund | Mar. 29, 2014 High yield debt securities | Dec. 31, 2013 High yield debt securities | Mar. 29, 2014 Emerging markets trading debt mutual fund | Dec. 31, 2013 Emerging markets trading debt mutual fund | Mar. 29, 2014 Money market funds held in trading accounts | Dec. 31, 2013 Money market funds held in trading accounts | Mar. 29, 2014 Emerging markets trading debt securities | Dec. 31, 2013 Emerging markets trading debt securities | Mar. 29, 2014 Recurring basis Balance at period end | Dec. 31, 2013 Recurring basis Balance at period end | Mar. 29, 2014 Recurring basis Balance at period end Commodities | Dec. 31, 2013 Recurring basis Balance at period end Commodities | Mar. 29, 2014 Recurring basis Balance at period end Interest rate swaps | Dec. 31, 2013 Recurring basis Balance at period end Interest rate swaps | Mar. 29, 2014 Recurring basis Balance at period end Foreign currencies | Dec. 31, 2013 Recurring basis Balance at period end Foreign currencies | Mar. 29, 2014 Recurring basis Balance at period end Other current assets Commodities | Dec. 31, 2013 Recurring basis Balance at period end Other current assets Commodities | Mar. 29, 2014 Recurring basis Balance at period end Other current liability Commodities | Dec. 31, 2013 Recurring basis Balance at period end Other current liability Commodities | Mar. 29, 2014 Recurring basis Balance at period end Money market funds Short-term investments | Dec. 31, 2013 Recurring basis Balance at period end Money market funds Short-term investments | Mar. 29, 2014 Recurring basis Balance at period end Money market funds Other current assets | Dec. 31, 2013 Recurring basis Balance at period end Money market funds Other current assets | Mar. 29, 2014 Recurring basis Balance at period end Corporate bonds Short-term investments | Dec. 31, 2013 Recurring basis Balance at period end Corporate bonds Short-term investments | Mar. 29, 2014 Recurring basis Balance at period end U.S. Government agency securities Short-term investments | Dec. 31, 2013 Recurring basis Balance at period end U.S. Government agency securities Short-term investments | Mar. 29, 2014 Recurring basis Balance at period end Asset backed debt securities Short-term investments | Dec. 31, 2013 Recurring basis Balance at period end Asset backed debt securities Short-term investments | Mar. 29, 2014 Recurring basis Balance at period end Collateralized mortgage obligations Short-term investments | Dec. 31, 2013 Recurring basis Balance at period end Collateralized mortgage obligations Short-term investments | Mar. 29, 2014 Recurring basis Balance at period end U.S. Treasury securities Short-term investments | Dec. 31, 2013 Recurring basis Balance at period end U.S. Treasury securities Short-term investments | Dec. 31, 2013 Recurring basis Balance at period end Emerging markets debt mutual fund Short-term investments | Mar. 29, 2014 Recurring basis Balance at period end High yield debt securities Short-term investments | Dec. 31, 2013 Recurring basis Balance at period end High yield debt securities Short-term investments | Mar. 29, 2014 Recurring basis Balance at period end Emerging markets trading debt mutual fund Short-term investments | Dec. 31, 2013 Recurring basis Balance at period end Emerging markets trading debt mutual fund Short-term investments | Mar. 29, 2014 Recurring basis Balance at period end Money market funds held in trading accounts Short-term investments | Dec. 31, 2013 Recurring basis Balance at period end Money market funds held in trading accounts Short-term investments | Mar. 29, 2014 Recurring basis Balance at period end Emerging markets trading debt securities Short-term investments | Dec. 31, 2013 Recurring basis Balance at period end Emerging markets trading debt securities Short-term investments | Mar. 29, 2014 Recurring basis Balance at period end Other trading investments Short-term investments | Dec. 31, 2013 Recurring basis Balance at period end Other trading investments Short-term investments | Mar. 29, 2014 Recurring basis Balance at period end Domestic equity securities Other current assets | Dec. 31, 2013 Recurring basis Balance at period end Domestic equity securities Other current assets | Mar. 29, 2014 Recurring basis Balance at period end Foreign equity securities Other current assets | Dec. 31, 2013 Recurring basis Balance at period end Foreign equity securities Other current assets | Mar. 29, 2014 Recurring basis Balance at period end Fixed income mutual funds Other current assets | Dec. 31, 2013 Recurring basis Balance at period end Fixed income mutual funds Other current assets | Mar. 29, 2014 Recurring basis Balance at period end Other Other current assets | Dec. 31, 2013 Recurring basis Balance at period end Other Other current assets | Mar. 29, 2014 Recurring basis Level 1 | Dec. 31, 2013 Recurring basis Level 1 | Mar. 29, 2014 Recurring basis Level 1 Commodities | Dec. 31, 2013 Recurring basis Level 1 Commodities | Mar. 29, 2014 Recurring basis Level 1 Money market funds Short-term investments | Dec. 31, 2013 Recurring basis Level 1 Money market funds Short-term investments | Mar. 29, 2014 Recurring basis Level 1 Money market funds Other current assets | Dec. 31, 2013 Recurring basis Level 1 Money market funds Other current assets | Dec. 31, 2013 Recurring basis Level 1 Emerging markets debt mutual fund Short-term investments | Mar. 29, 2014 Recurring basis Level 1 Emerging markets trading debt mutual fund Short-term investments | Dec. 31, 2013 Recurring basis Level 1 Emerging markets trading debt mutual fund Short-term investments | Mar. 29, 2014 Recurring basis Level 1 Money market funds held in trading accounts Short-term investments | Dec. 31, 2013 Recurring basis Level 1 Money market funds held in trading accounts Short-term investments | Mar. 29, 2014 Recurring basis Level 1 Domestic equity securities Other current assets | Dec. 31, 2013 Recurring basis Level 1 Domestic equity securities Other current assets | Mar. 29, 2014 Recurring basis Level 1 Foreign equity securities Other current assets | Dec. 31, 2013 Recurring basis Level 1 Foreign equity securities Other current assets | Mar. 29, 2014 Recurring basis Level 1 Fixed income mutual funds Other current assets | Dec. 31, 2013 Recurring basis Level 1 Fixed income mutual funds Other current assets | Mar. 29, 2014 Recurring basis Level 1 Other Other current assets | Dec. 31, 2013 Recurring basis Level 1 Other Other current assets | Mar. 29, 2014 Recurring basis Level 2 | Dec. 31, 2013 Recurring basis Level 2 | Mar. 29, 2014 Recurring basis Level 2 Commodities | Dec. 31, 2013 Recurring basis Level 2 Commodities | Mar. 29, 2014 Recurring basis Level 2 Interest rate swaps | Dec. 31, 2013 Recurring basis Level 2 Interest rate swaps | Mar. 29, 2014 Recurring basis Level 2 Foreign currencies | Dec. 31, 2013 Recurring basis Level 2 Foreign currencies | Mar. 29, 2014 Recurring basis Level 2 Corporate bonds Short-term investments | Dec. 31, 2013 Recurring basis Level 2 Corporate bonds Short-term investments | Mar. 29, 2014 Recurring basis Level 2 U.S. Government agency securities Short-term investments | Dec. 31, 2013 Recurring basis Level 2 U.S. Government agency securities Short-term investments | Mar. 29, 2014 Recurring basis Level 2 Asset backed debt securities Short-term investments | Dec. 31, 2013 Recurring basis Level 2 Asset backed debt securities Short-term investments | Mar. 29, 2014 Recurring basis Level 2 Collateralized mortgage obligations Short-term investments | Dec. 31, 2013 Recurring basis Level 2 Collateralized mortgage obligations Short-term investments | Mar. 29, 2014 Recurring basis Level 2 U.S. Treasury securities Short-term investments | Dec. 31, 2013 Recurring basis Level 2 U.S. Treasury securities Short-term investments | Mar. 29, 2014 Recurring basis Level 2 High yield debt securities Short-term investments | Dec. 31, 2013 Recurring basis Level 2 High yield debt securities Short-term investments | Mar. 29, 2014 Recurring basis Level 2 Emerging markets trading debt securities Short-term investments | Dec. 31, 2013 Recurring basis Level 2 Emerging markets trading debt securities Short-term investments | Mar. 29, 2014 Recurring basis Level 2 Other trading investments Short-term investments | Dec. 31, 2013 Recurring basis Level 2 Other trading investments Short-term investments | Mar. 29, 2014 Recurring basis Level 2 Foreign equity securities Other current assets | Dec. 31, 2013 Recurring basis Level 2 Foreign equity securities Other current assets | Mar. 29, 2014 Recurring basis Level 2 Other Other current assets | Dec. 31, 2013 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 |  |  |  | 216,623,000 | 88,430,000 | 49,482,000 | 70,258,000 | 47,554,000 | 27,147,000 | 11,938,000 | 8,477,000 | 6,451,000 | 7,600,000 | 2,770,000 | 5,223,000 | 16,941,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 216,623,000 | 88,430,000 |  |  | 49,482,000 | 70,258,000 | 47,554,000 | 27,147,000 | 11,938,000 | 8,477,000 | 6,451,000 | 7,600,000 | 2,770,000 | 5,223,000 | 16,941,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 216,623,000 | 88,430,000 |  |  | 16,941,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 49,482,000 | 70,258,000 | 47,554,000 | 27,147,000 | 11,938,000 | 8,477,000 | 6,451,000 | 7,600,000 | 2,770,000 | 5,223,000 |  |  |  |  |  |  |  |  |  |
Trading securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 51,923,000 | 50,428,000 | 2,856,000 | 2,858,000 | 1,287,000 | 11,033,000 | 729,000 | 1,336,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,102,000 | 1,931,000 |  |  |  |  |  |  |  |  |  |  |  | 51,923,000 | 50,428,000 | 2,856,000 | 2,858,000 | 1,287,000 | 11,033,000 | 729,000 | 1,336,000 | 609,000 | 918,000 | 28,210,000 | 26,672,000 | 7,943,000 | 9,570,000 | 4,909,000 | 3,974,000 | 3,641,000 | 3,203,000 |  |  |  |  |  |  | 2,102,000 | 1,931,000 |  | 2,856,000 | 2,858,000 | 1,287,000 | 11,033,000 | 28,210,000 | 26,672,000 | 5,676,000 | 7,317,000 | 4,909,000 | 3,974,000 | 1,702,000 | 1,628,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 51,923,000 | 50,428,000 | 729,000 | 1,336,000 | 609,000 | 918,000 | 2,267,000 | 2,253,000 | 1,939,000 | 1,575,000
Derivatives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,402,000 | 2,331,000 | 388,000 |  | 59,000 | 2,763,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,402,000 | 2,331,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 388,000 |  | 59,000 | 2,763,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Margin account |  | 42,622,000 | 29,822,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 42,622,000 | 29,822,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 458,876,000 | 341,093,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 282,767,000 | 163,115,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 176,109,000 | 177,978,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative assets and liabilities, net basis |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,638,000 | 16,731,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 43,271,000 | 16,014,000 | 4,551,000 | 4,103,000 | 2,043,000 | 101,000 |  |  | 885,000 | 592,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 42,386,000 | 15,422,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 885,000 | 592,000 | 4,551,000 | 4,103,000 | 2,043,000 | 101,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 49,865,000 | $ 20,218,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 42,386,000 | $ 15,422,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,479,000 | $ 4,796,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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