CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 25, 2011
OPERATING ACTIVITIES
Net income	$ 62,702	$ 50,155
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of operating property and intangible assets	13,404	12,787
Non-cash interest charges	109	109
Provisions for losses on trade and other accounts receivable	1,830	2,862
Losses (gains) on sales/disposals of operating property	(2,008)	106
Deferred income taxes, net	6,901	(3,715)
Stock-based compensation	3,186	2,473
Changes in operating assets and liabilities:
Increase in trade and other accounts receivable	(58,187)	(82,602)
Decrease (increase) in other assets	(4,619)	101
Increase in accounts payable	40,612	38,028
Increase (decrease) in other liabilities	545	(869)
Increase (decrease) in insurance claims	(9,665)	4,032
NET CASH PROVIDED BY OPERATING ACTIVITIES	54,810	23,467
INVESTING ACTIVITIES
Sales and maturities of investments	13,277	44,822
Purchases of investments	(36,233)	(39,441)
Purchases of operating property	(2,982)	(2,829)
Proceeds from sales of operating property	6,250	729
NET CASH PROVIDED (USED) BY INVESTING ACTIVITIES	(19,688)	3,281
FINANCING ACTIVITIES
Increase (decrease) in cash overdraft	(1,833)	1,470
Dividends paid	(5,157)	(4,788)
Proceeds from exercises of stock options	1,133	555
Excess (shortfall) tax effect on stock option exercises	886	(122)
Borrowings on revolving credit facility	60,000
Purchases of common stock	(15,752)	(9,266)
Principal payments on long-term debt and capital lease obligations	(90,840)	(11,972)
Purchase of noncontrolling interest		(8,000)
NET CASH USED BY FINANCING ACTIVITIES	(51,563)	(32,123)
Effect of exchange rate changes on cash and cash equivalents	(64)	213
Decrease in cash and cash equivalents	(16,505)	(5,162)
Cash and cash equivalents at beginning of period	80,900	44,706
Cash and cash equivalents at end of period	$ 64,395	$ 39,544