Derivatives and Fair Value of Financial Instruments-Deferred Comp Securities (Details) - USD ($)	9 Months Ended
	Oct. 03, 2015	Dec. 31, 2014
Assets and liabilities measured at fair value on a recurring basis and also its level within the fair value hierarchy
Transfers that occurred into or out of level 2	$ 0
Transfers that occurred into or out of level 3	0
Commodities
Assets:
Margin account	34,852,000	$ 4,314,000
Money market funds
Assets:
Available-for-sale securities	100,648,000	142,432,000
Domestic equity securities
Assets:
Trading securities	158,815,000
High yield trading debt securities
Assets:
Trading securities	122,178,000	181,483,000
Domestic equity mutual fund
Assets:
Trading securities	80,525,000	82,542,000
Domestic equity ETF
Assets:
Trading securities	77,443,000	32,651,000
Foreign equity securities
Assets:
Trading securities	76,669,000
Money market funds held in trading accounts
Assets:
Trading securities	40,152,000	21,401,000
Foreign equity mutual fund
Assets:
Trading securities	19,831,000
Collateralized loan obligation
Assets:
Trading securities	9,791,000
Corporate bonds
Assets:
Available-for-sale securities		11,015,000
U.S. Government agency securities
Assets:
Available-for-sale securities		9,666,000
Other available-for-sale securities
Assets:
Available-for-sale securities		3,983,000
Recurring basis | Fair Value
Assets:
Total Assets	747,557,000	546,012,000
Liabilities:
Liabilities	31,870,000	9,901,000
Recurring basis | Fair Value | Commodities
Assets:
Derivatives	9,639,000	6,136,000
Margin account	34,852,000	4,314,000
Liabilities:
Derivatives	21,739,000	1,779,000
Recurring basis | Fair Value | Interest rate swaps
Liabilities:
Derivatives	8,714,000	7,715,000
Recurring basis | Fair Value | Foreign currencies
Assets:
Derivatives	1,715,000	1,675,000
Liabilities:
Derivatives	1,417,000	407,000
Recurring basis | Fair Value | Other current assets | Commodities
Assets:
Derivative assets and liabilities, net basis	22,949,000	9,267,000
Recurring basis | Fair Value | Other current liabilities | Commodities
Liabilities:
Derivatives	197,000	596,000
Recurring basis | Fair Value | Money market funds | Short-term investments.
Assets:
Available-for-sale securities	100,648,000	142,432,000
Recurring basis | Fair Value | Domestic equity securities | Short-term investments.
Assets:
Trading securities	158,815,000
Recurring basis | Fair Value | Domestic equity securities | Other current assets
Assets:
Trading securities	34,044,000	33,857,000
Recurring basis | Fair Value | High yield trading debt securities | Short-term investments.
Assets:
Trading securities	122,178,000	181,483,000
Recurring basis | Fair Value | Domestic equity mutual fund | Short-term investments.
Assets:
Trading securities	80,525,000	82,542,000
Recurring basis | Fair Value | Domestic equity ETF | Short-term investments.
Assets:
Trading securities	77,443,000	32,651,000
Recurring basis | Fair Value | Foreign equity securities | Short-term investments.
Assets:
Trading securities	76,669,000
Recurring basis | Fair Value | Foreign equity securities | Other current assets
Assets:
Trading securities	6,246,000	6,532,000
Recurring basis | Fair Value | Money market funds held in trading accounts | Short-term investments.
Assets:
Trading securities	40,152,000	21,401,000
Recurring basis | Fair Value | Foreign equity mutual fund | Short-term investments.
Assets:
Trading securities	19,831,000
Recurring basis | Fair Value | Collateralized loan obligation | Short-term investments.
Assets:
Trading securities	9,791,000
Recurring basis | Fair Value | Other | Other current assets
Assets:
Trading securities	3,104,000	2,676,000
Recurring basis | Fair Value | Corporate bonds | Short-term investments.
Assets:
Available-for-sale securities		11,015,000
Recurring basis | Fair Value | U.S. Government agency securities | Short-term investments.
Assets:
Available-for-sale securities		9,666,000
Recurring basis | Fair Value | Other available-for-sale securities | Short-term investments.
Assets:
Available-for-sale securities		3,983,000
Recurring basis | Fair Value | Other trading investments | Short-term investments.
Assets:
Trading securities	3,391,000	5,393,000
Recurring basis | Fair Value | Fixed income mutual funds | Other current assets
Assets:
Trading securities	3,366,000	4,570,000
Recurring basis | Level 1
Assets:
Total Assets	612,182,000	335,140,000
Liabilities:
Liabilities	21,739,000	1,779,000
Recurring basis | Level 1 | Commodities
Assets:
Derivatives	9,639,000	6,136,000
Liabilities:
Derivatives	21,739,000	1,779,000
Recurring basis | Level 1 | Money market funds | Short-term investments.
Assets:
Available-for-sale securities	100,648,000	142,432,000
Recurring basis | Level 1 | Domestic equity securities | Short-term investments.
Assets:
Trading securities	158,815,000
Recurring basis | Level 1 | Domestic equity securities | Other current assets
Assets:
Trading securities	34,044,000	33,857,000
Recurring basis | Level 1 | Domestic equity mutual fund | Short-term investments.
Assets:
Trading securities	80,525,000	82,542,000
Recurring basis | Level 1 | Domestic equity ETF | Short-term investments.
Assets:
Trading securities	77,443,000	32,651,000
Recurring basis | Level 1 | Foreign equity securities | Short-term investments.
Assets:
Trading securities	76,669,000
Recurring basis | Level 1 | Foreign equity securities | Other current assets
Assets:
Trading securities	6,246,000	6,532,000
Recurring basis | Level 1 | Money market funds held in trading accounts | Short-term investments.
Assets:
Trading securities	40,152,000	21,401,000
Recurring basis | Level 1 | Foreign equity mutual fund | Short-term investments.
Assets:
Trading securities	19,831,000
Recurring basis | Level 1 | Other | Other current assets
Assets:
Trading securities	2,617,000	2,405,000
Recurring basis | Level 1 | Other trading investments | Short-term investments.
Assets:
Trading securities	2,187,000	2,614,000
Recurring basis | Level 1 | Fixed income mutual funds | Other current assets
Assets:
Trading securities	3,366,000	4,570,000
Recurring basis | Level 2
Assets:
Total Assets	135,375,000	210,872,000
Liabilities:
Liabilities	10,131,000	8,122,000
Recurring basis | Level 2 | Interest rate swaps
Liabilities:
Derivatives	8,714,000	7,715,000
Recurring basis | Level 2 | Foreign currencies
Assets:
Derivatives	1,715,000	1,675,000
Liabilities:
Derivatives	1,417,000	407,000
Recurring basis | Level 2 | High yield trading debt securities | Short-term investments.
Assets:
Trading securities	122,178,000	181,483,000
Recurring basis | Level 2 | Collateralized loan obligation | Short-term investments.
Assets:
Trading securities	9,791,000
Recurring basis | Level 2 | Other | Other current assets
Assets:
Trading securities	487,000	271,000
Recurring basis | Level 2 | Corporate bonds | Short-term investments.
Assets:
Available-for-sale securities		11,015,000
Recurring basis | Level 2 | U.S. Government agency securities | Short-term investments.
Assets:
Available-for-sale securities		9,666,000
Recurring basis | Level 2 | Other available-for-sale securities | Short-term investments.
Assets:
Available-for-sale securities		3,983,000
Recurring basis | Level 2 | Other trading investments | Short-term investments.
Assets:
Trading securities	$ 1,204,000	$ 2,779,000