Condensed Consolidated Statements of Cash Flows (USD $)	6 Months Ended
	Jun. 30, 2012	Jul. 02, 2011
Cash flows from operating activities:
Net earnings	$ 131,692,000	$ 230,057,000
Adjustments to reconcile net earnings to cash from operating activities:
Depreciation and amortization	44,333,000	40,417,000
Gain on sale of power generating facilities		(51,423,000)
Gain from sale of fixed assets	(2,951,000)	(503,000)
Deferred income taxes	(17,689,000)	(15,564,000)
Pay-in-kind interest and accretion on note receivable from affiliate	(5,758,000)	(5,142,000)
Income from affiliates	(19,385,000)	(11,527,000)
Other investment income, net	(2,490,000)	(2,626,000)
Other	3,029,000	1,662,000
Changes in current assets and liabilities, net of business acquired:
Receivables, net of allowance	(15,590,000)	(74,689,000)
Inventories	83,692,000	(91,316,000)
Other current assets	(1,421,000)	65,140,000
Current liabilities, exclusive of debt	(64,732,000)	(88,516,000)
Other, net	10,523,000	7,489,000
Net cash from operating activities	143,253,000	3,459,000
Cash flows from investing activities:
Purchase of short-term investments	(434,890,000)	(99,984,000)
Proceeds from the sale of short-term investments	300,911,000	101,308,000
Proceeds from the maturity of short-term investments	19,993,000	11,973,000
Investments in and advances to affiliates, net	(6,791,000)	(6,351,000)
Capital expenditures	(68,056,000)	(76,489,000)
Proceeds from the sale of fixed assets	5,839,000	953,000
Proceeds from the sale of power generating facilities		58,103,000
Principal payments received on long-term notes receivable from affiliate	564,000
Purchase of long-term investments	(6,525,000)	(308,000)
Acquisition of business, net of cash acquired	(2,825,000)
Other, net	545,000	164,000
Net cash from investing activities	(191,235,000)	(10,631,000)
Cash flows from financing activities:
Notes payable to banks, net	14,135,000	13,251,000
Proceeds from the issuance of long-term debt	32,682,000	16,056,000
Principal payments of long-term debt	(5,928,000)	(195,000)
Repurchase of common stock	(15,949,000)
Other, net	208,000	157,000
Net cash from financing activities	25,148,000	29,269,000
Effect of exchange rate change on cash	(550,000)	1,307,000
Net change in cash and cash equivalents	(23,384,000)	23,404,000
Cash and cash equivalents at beginning of year	71,510,000	41,124,000
Cash and cash equivalents at end of period	$ 48,126,000	$ 64,528,000