Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
OPERATING ACTIVITIES
Net income	$ 255,213	$ 176,996	$ 137,350
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of operating property and intangible assets	43,570	40,560	35,796
Non-cash interest charges	253	253	238
Provisions for losses on trade and other accounts receivable	7,415	7,439	5,735
Gains on sales/disposals of operating property	(979)	(774)	(3,477)
Deferred income taxes, net	2,115	(17,031)	6,328
Stock-based compensation	18,256	7,721	2,747
Changes in operating assets and liabilities:
Increase in trade and other accounts receivable	(57,419)	(181,235)	(6,233)
(Increase) decrease in other assets	(2,962)	(1,966)	9,298
Increase (decrease) in accounts payable	22,527	68,859	(9,598)
Increase in other liabilities	8,367	22,085	288
Increase in insurance claims	1,545	16,056	11,770
NET CASH PROVIDED BY OPERATING ACTIVITIES	297,901	138,963	190,242
INVESTING ACTIVITIES
Sales and maturities of investments	51,576	56,442	41,795
Purchases of investments	(54,041)	(58,504)	(43,529)
Purchases of operating property	(9,747)	(15,586)	(22,645)
Proceeds from sales of operating property	4,018	4,032	10,212
Consideration paid for acquisitions		(8,460)
NET CASH USED BY INVESTING ACTIVITIES	(8,194)	(22,076)	(14,167)
FINANCING ACTIVITIES
Increase in cash overdraft	13,097	5,991	642
Dividends paid	(88,918)	(15,938)	(14,332)
Payment for debt issue costs			(1,048)
Proceeds from exercises of stock options	1,435	3,183	2,329
Taxes paid in lieu of shares issued related to stock-based compensation plans	(3,938)	(881)	(3,043)
Excess tax benefits from stock-based awards			1,386
Purchases of common stock	(208,087)		(50,516)
Principal payments on capital lease obligations	(43,283)	(46,751)	(47,492)
Payment of contingent consideration	(985)
NET CASH USED BY FINANCING ACTIVITIES	(330,679)	(54,396)	(112,074)
Effect of exchange rate changes on cash and cash equivalents	(1,708)	1,028	376
(Decrease) increase in cash and cash equivalents	(42,680)	63,519	64,377
Cash and cash equivalents at beginning of period	242,416	178,897	114,520
Cash and cash equivalents at end of period	$ 199,736	$ 242,416	$ 178,897

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