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Derivatives and Fair Value of Financial Instruments (Details) (USD $) | 6 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Jun. 28, 2014 | Jun. 28, 2014 Commodities | Dec. 31, 2013 Commodities | Jun. 28, 2014 Money market funds | Dec. 31, 2013 Money market funds | Jun. 28, 2014 Corporate bonds | Dec. 31, 2013 Corporate bonds | Jun. 28, 2014 U.S. Government agency securities | Dec. 31, 2013 U.S. Government agency securities | Jun. 28, 2014 Asset backed debt securities | Dec. 31, 2013 Asset backed debt securities | Jun. 28, 2014 Collateralized mortgage obligations | Dec. 31, 2013 Collateralized mortgage obligations | Jun. 28, 2014 U.S. Treasury securities | Dec. 31, 2013 U.S. Treasury securities | Dec. 31, 2013 Emerging markets debt mutual fund | Jun. 28, 2014 High yield debt securities | Dec. 31, 2013 High yield debt securities | Jun. 28, 2014 Equity mutual fund | Jun. 28, 2014 Money market funds held in trading accounts | Dec. 31, 2013 Money market funds held in trading accounts | Jun. 28, 2014 Domestic equity ETF | Jun. 28, 2014 Emerging markets trading debt mutual fund | Dec. 31, 2013 Emerging markets trading debt mutual fund | Jun. 28, 2014 Emerging markets trading debt securities | Dec. 31, 2013 Emerging markets trading debt securities | Jun. 28, 2014 Recurring basis Balance at period end | Dec. 31, 2013 Recurring basis Balance at period end | Jun. 28, 2014 Recurring basis Balance at period end Commodities | Dec. 31, 2013 Recurring basis Balance at period end Commodities | Jun. 28, 2014 Recurring basis Balance at period end Interest rate swaps | Dec. 31, 2013 Recurring basis Balance at period end Interest rate swaps | Jun. 28, 2014 Recurring basis Balance at period end Foreign currencies | Dec. 31, 2013 Recurring basis Balance at period end Foreign currencies | Jun. 28, 2014 Recurring basis Balance at period end Other current assets Commodities | Dec. 31, 2013 Recurring basis Balance at period end Other current assets Commodities | Jun. 28, 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 | Jun. 28, 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 | Jun. 28, 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 | Jun. 28, 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 | Jun. 28, 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 | Jun. 28, 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 | Jun. 28, 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 | Jun. 28, 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 | Jun. 28, 2014 Recurring basis Balance at period end Equity mutual fund Short-term investments | Jun. 28, 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 | Jun. 28, 2014 Recurring basis Balance at period end Domestic equity ETF Short-term investments | Jun. 28, 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 | Jun. 28, 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 | Jun. 28, 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 | Jun. 28, 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 | Jun. 28, 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 | Jun. 28, 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 | Jun. 28, 2014 Recurring basis Balance at period end Other Other current assets | Dec. 31, 2013 Recurring basis Balance at period end Other Other current assets | Jun. 28, 2014 Recurring basis Level 1 | Dec. 31, 2013 Recurring basis Level 1 | Jun. 28, 2014 Recurring basis Level 1 Commodities | Dec. 31, 2013 Recurring basis Level 1 Commodities | Jun. 28, 2014 Recurring basis Level 1 Money market funds Short-term investments | Dec. 31, 2013 Recurring basis Level 1 Money market funds Short-term investments | Jun. 28, 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 | Jun. 28, 2014 Recurring basis Level 1 Equity mutual fund Short-term investments | Jun. 28, 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 | Jun. 28, 2014 Recurring basis Level 1 Domestic equity ETF Short-term investments | Jun. 28, 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 | Jun. 28, 2014 Recurring basis Level 1 Domestic equity securities Other current assets | Dec. 31, 2013 Recurring basis Level 1 Domestic equity securities Other current assets | Jun. 28, 2014 Recurring basis Level 1 Foreign equity securities Other current assets | Dec. 31, 2013 Recurring basis Level 1 Foreign equity securities Other current assets | Jun. 28, 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 | Jun. 28, 2014 Recurring basis Level 1 Other Other current assets | Dec. 31, 2013 Recurring basis Level 1 Other Other current assets | Jun. 28, 2014 Recurring basis Level 2 | Dec. 31, 2013 Recurring basis Level 2 | Jun. 28, 2014 Recurring basis Level 2 Commodities | Dec. 31, 2013 Recurring basis Level 2 Commodities | Jun. 28, 2014 Recurring basis Level 2 Interest rate swaps | Dec. 31, 2013 Recurring basis Level 2 Interest rate swaps | Jun. 28, 2014 Recurring basis Level 2 Foreign currencies | Dec. 31, 2013 Recurring basis Level 2 Foreign currencies | Jun. 28, 2014 Recurring basis Level 2 Corporate bonds Short-term investments | Dec. 31, 2013 Recurring basis Level 2 Corporate bonds Short-term investments | Jun. 28, 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 | Jun. 28, 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 | Jun. 28, 2014 Recurring basis Level 2 Collateralized mortgage obligations Short-term investments | Dec. 31, 2013 Recurring basis Level 2 Collateralized mortgage obligations Short-term investments | Jun. 28, 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 | Jun. 28, 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 | Jun. 28, 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 | Jun. 28, 2014 Recurring basis Level 2 Other trading investments Short-term investments | Dec. 31, 2013 Recurring basis Level 2 Other trading investments Short-term investments | Jun. 28, 2014 Recurring basis Level 2 Foreign equity securities Other current assets | Dec. 31, 2013 Recurring basis Level 2 Foreign equity securities Other current assets | Jun. 28, 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 |  |  |  | 66,993,000 | 88,430,000 | 49,921,000 | 70,258,000 | 43,629,000 | 27,147,000 | 10,791,000 | 8,477,000 | 5,584,000 | 7,600,000 | 5,035,000 | 5,223,000 | 16,941,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 66,993,000 | 88,430,000 |  |  | 49,921,000 | 70,258,000 | 43,629,000 | 27,147,000 | 10,791,000 | 8,477,000 | 5,584,000 | 7,600,000 | 5,035,000 | 5,223,000 | 16,941,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 66,993,000 | 88,430,000 |  |  | 16,941,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 49,921,000 | 70,258,000 | 43,629,000 | 27,147,000 | 10,791,000 | 8,477,000 | 5,584,000 | 7,600,000 | 5,035,000 | 5,223,000 |  |  |  |  |  |  |  |  |  |
Trading securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 103,163,000 | 50,428,000 | 25,017,000 | 5,728,000 | 11,033,000 | 5,107,000 | 2,988,000 | 2,858,000 | 621,000 | 1,336,000 |  |  |  |  |  |  |  |  |  |  |  |  | 2,273,000 | 1,931,000 |  |  |  |  |  |  |  |  |  |  |  | 103,163,000 | 50,428,000 | 25,017,000 | 5,728,000 | 11,033,000 | 5,107,000 | 2,988,000 | 2,858,000 | 621,000 | 1,336,000 | 557,000 | 918,000 | 30,869,000 | 26,672,000 | 8,450,000 | 9,570,000 | 4,945,000 | 3,974,000 | 2,083,000 | 3,203,000 |  |  |  |  |  |  | 2,273,000 | 1,931,000 |  | 25,017,000 | 5,728,000 | 11,033,000 | 5,107,000 | 2,988,000 | 2,858,000 | 30,869,000 | 26,672,000 | 7,049,000 | 7,317,000 | 4,945,000 | 3,974,000 | 177,000 | 1,628,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 103,163,000 | 50,428,000 | 621,000 | 1,336,000 | 557,000 | 918,000 | 1,401,000 | 2,253,000 | 1,906,000 | 1,575,000
Derivatives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,560,000 | 2,331,000 |  |  | 2,101,000 | 2,763,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,560,000 | 2,331,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,101,000 | 2,763,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 385,415,000 | 341,093,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 160,706,000 | 163,115,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 224,709,000 | 177,978,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Margin account |  | 44,039,000 | 29,822,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 44,039,000 | 29,822,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative assets and liabilities, net basis |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,585,000 | 16,731,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 38,166,000 | 16,014,000 | 6,901,000 | 4,103,000 | 378,000 | 101,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 38,014,000 | 15,422,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 152,000 | 592,000 | 6,901,000 | 4,103,000 | 378,000 | 101,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 45,445,000 | $ 20,218,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 38,014,000 | $ 15,422,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,431,000 | $ 4,796,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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