Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
OPERATING ACTIVITIES
Net income	$ 40,895	$ 63,300
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of operating property and intangible assets	11,505	11,316
Non-cash interest charges	63	63
Provisions for losses on trade and other accounts receivable	4,122	2,150
Gains on sales/disposals of operating property	(858)	(876)
Deferred income taxes, net	797	2,079
Stock-based compensation	631	1,938
Changes in operating assets and liabilities:
Decrease in trade and other accounts receivable	21,369	84,505
Decrease in other assets	9,987	2,229
Increase (decrease) in accounts payable	179	(40,953)
Increase (decrease) in other liabilities	4,404	(3,776)
Increase (decrease) in insurance claims	6,122	(559)
NET CASH PROVIDED BY OPERATING ACTIVITIES	99,216	121,416
INVESTING ACTIVITIES
Net changes in other short-term investments	131
Sales and maturities of investments	7,963	25,739
Purchases of investments	(8,830)	(26,707)
Purchases of operating property	(5,799)	(4,576)
Proceeds from sales of operating property	2,081	2,130
NET CASH USED BY INVESTING ACTIVITIES	(4,454)	(3,414)
FINANCING ACTIVITIES
Decrease in cash overdraft	(17,876)	(13,820)
Dividends paid	(86,283)	(6,629)
Proceeds from exercises of stock options	575	319
Taxes paid in lieu of shares issued related to stock-based compensation plans	(2,994)	(7,923)
Purchases of common stock	(115,962)	(12,977)
Principal payments on finance lease obligations	(10,923)	(11,995)
Purchase of noncontrolling interest		(600)
NET CASH USED BY FINANCING ACTIVITIES	(233,463)	(53,625)
Effect of exchange rate changes on cash and cash equivalents	(3,590)	512
(Decrease) increase in cash and cash equivalents	(142,291)	64,889
Cash and cash equivalents at beginning of period	319,515	199,736
Cash and cash equivalents at end of period	$ 177,224	$ 264,625