CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 29, 2012	Sep. 24, 2011
OPERATING ACTIVITIES
Net income	$ 95,803	$ 80,313
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of operating property and intangible assets	20,476	19,336
Non-cash interest charges	164	164
Provisions for losses on trade and other accounts receivable	3,436	4,308
Gains on sales/disposals of operating property	(2,728)	(253)
Deferred income taxes, net	6,223	(4,205)
Stock-based compensation	4,613	3,783
Changes in operating assets and liabilities:
Increase in trade and other accounts receivable	(63,246)	(114,765)
Decrease in other assets	603	3,957
Increase in accounts payable	49,346	43,191
Increase (decrease) in other liabilities	(1,083)	14,401
Increase (decrease) in insurance claims	(10,322)	34,164
NET CASH PROVIDED BY OPERATING ACTIVITIES	103,285	84,394
INVESTING ACTIVITIES
Sales and maturities of investments	20,889	65,646
Purchases of investments	(44,261)	(58,279)
Purchases of operating property	(4,428)	(3,460)
Proceeds from sales of operating property	8,997	2,463
NET CASH PROVIDED (USED) BY INVESTING ACTIVITIES	(18,803)	6,370
FINANCING ACTIVITIES
Increase (decrease) in cash overdraft	814	(1,816)
Dividends paid	(7,956)	(7,407)
Proceeds from exercises of stock options	1,287	656
Excess (shortfall) tax effect on stock option exercises	839	(122)
Borrowings on revolving credit facility	60,000	10,000
Purchases of common stock	(24,582)	(41,966)
Principal payments on long-term debt and capital lease obligations	(116,180)	(17,575)
Purchase of noncontrolling interest		(8,000)
NET CASH USED BY FINANCING ACTIVITIES	(85,778)	(66,230)
Effect of exchange rate changes on cash and cash equivalents	357	169
Increase (decrease) in cash and cash equivalents	(939)	24,703
Cash and cash equivalents at beginning of period	80,900	44,706
Cash and cash equivalents at end of period	$ 79,961	$ 69,409