Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 28, 2015	Mar. 29, 2014
OPERATING ACTIVITIES
Net income	$ 30,015us-gaap_NetIncomeLoss	$ 27,638us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of operating property	7,019us-gaap_DepreciationAndAmortization	6,768us-gaap_DepreciationAndAmortization
Non-cash interest charges	55us-gaap_AmortizationOfDeferredCharges	54us-gaap_AmortizationOfDeferredCharges
Provisions for losses on trade and other accounts receivable	702us-gaap_ProvisionForDoubtfulAccounts	729us-gaap_ProvisionForDoubtfulAccounts
Gains on sales/disposals of operating property	(107)	(59)
Deferred income taxes, net	885	(2,088)
Stock-based compensation	1,667us-gaap_ShareBasedCompensation	1,164us-gaap_ShareBasedCompensation
Changes in operating assets and liabilities:
Decrease (increase) in trade and other accounts receivable	29,939us-gaap_IncreaseDecreaseInReceivables	(41,625)us-gaap_IncreaseDecreaseInReceivables
Decrease (increase) in other assets	11,216	(1,560)
(Decrease) increase in accounts payable	(23,862)	13,289
(Decrease) increase in other liabilities	(9,580)	8,108
Increase in insurance claims	1,321	1,251
NET CASH PROVIDED BY OPERATING ACTIVITIES	49,270	13,669
INVESTING ACTIVITIES
Net change in other short-term investments		(3,249)
Sales and maturities of investments	10,651	14,558
Purchases of investments	(11,107)	(15,058)
Purchases of operating property	(2,450)	(732)
Proceeds from sales of operating property	656	276
NET CASH USED BY INVESTING ACTIVITIES	(2,250)	(4,205)
FINANCING ACTIVITIES
Decrease in cash overdraft	(6,219)	(6,601)
Dividends paid	(47,906)us-gaap_PaymentsOfDividends	(18,641)us-gaap_PaymentsOfDividends
Proceeds from exercises of stock options	429	1,133
Taxes paid in lieu of shares issued related to stock-based compensation plans	(2,069)	(1,650)
Excess tax benefits from stock-based awards	486	505
Purchases of common stock	(31,300)	(37,052)
Principal payments on long-term debt and capital lease obligations	(9,218)	(12,862)
NET CASH USED BY FINANCING ACTIVITIES	(95,797)	(75,168)
Effect of exchange rate changes on cash and cash equivalents	(280)	(432)
Decrease in cash and cash equivalents	(49,057)	(66,136)
Cash and cash equivalents at beginning of period	163,944	180,302
Cash and cash equivalents at end of period	$ 114,887	$ 114,166

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 5

-Article 5

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- Definition

The cash outflow associated with security instruments that either represent a creditor or an ownership relationship with the holder of the investment security with a maturity of beyond one year or normal operating cycle, if longer. Includes repayments of (a) debt, (b) capital lease obligations, (c) mandatory redeemable capital securities, and (d) any combination of (a), (b), or (c).

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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