Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019
OPERATING ACTIVITIES
Net income	$ 65,149	$ 124,400
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of operating property and intangible assets	22,972	22,350
Non-cash interest charges	126	126
Provisions for losses on trade and other accounts receivable	6,528	4,194
Gains on sales/disposals of operating property	(1,812)	(1,219)
Impairment of intangible and other assets	2,582
Deferred income taxes, net	6,228	5,060
Stock-based compensation	1,201	3,368
Changes in operating assets and liabilities:
Decrease in trade and other accounts receivable	99,601	89,820
Increase in other assets	(24,809)	(22,808)
Decrease in accounts payable	(31)	(28,565)
Increase (decrease) in other liabilities	10,231	(14,315)
Increase in insurance claims	10,419	1,665
NET CASH PROVIDED BY OPERATING ACTIVITIES	198,385	184,076
INVESTING ACTIVITIES
Net changes in other short-term investments	131
Sales and maturities of investments	14,897	41,345
Purchases of investments	(16,382)	(42,812)
Purchases of operating property	(17,676)	(9,224)
Proceeds from sales of operating property	4,465	3,219
Consideration paid for acquisition	(2,701)
NET CASH USED BY INVESTING ACTIVITIES	(17,266)	(7,472)
FINANCING ACTIVITIES
Decrease in cash overdraft	(18,344)	(11,719)
Dividends paid	(93,382)	(13,257)
Proceeds from exercises of stock options	614	343
Taxes paid in lieu of shares issued related to stock-based compensation plans	(3,280)	(8,438)
Purchases of common stock	(115,962)	(69,729)
Principal payments on finance lease obligations	(21,958)	(23,658)
Purchase of noncontrolling interest		(600)
NET CASH USED BY FINANCING ACTIVITIES	(252,312)	(127,058)
Effect of exchange rate changes on cash and cash equivalents	(2,851)	930
(Decrease) increase in cash and cash equivalents	(74,044)	50,476
Cash and cash equivalents at beginning of period	319,515	199,736
Cash and cash equivalents at end of period	$ 245,471	$ 250,212