Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 28, 2013	Dec. 29, 2012
Current Assets
Cash and cash equivalents	$ 97,552	$ 74,284
Short-term investments	34,568	35,528
Trade accounts receivable, less allowance of $8,252 and $8,650	394,796	408,787
Other receivables, including advances to independent contractors, less allowance of $3,955 and $4,657	77,169	55,278
Deferred income taxes and other current assets	18,983	18,067
Total current assets	623,068	591,944
Operating property, less accumulated depreciation and amortization of $157,901 and $158,999	184,441	158,953
Goodwill	57,470	57,470
Other assets	85,953	71,054
Total assets	950,932	879,421
Current Liabilities
Cash overdraft	26,894	33,647
Accounts payable	194,134	188,981
Current maturities of long-term debt	27,347	19,016
Insurance claims	89,877	64,509
Other current liabilities	32,922	38,186
Total current liabilities	371,174	344,339
Long-term debt, excluding current maturities	90,709	95,125
Insurance claims	23,119	21,896
Deferred income taxes and other noncurrent liabilities	42,669	38,607
Shareholders' Equity
Common stock, $0.01 par value, authorized 160,000,000 shares, issued 67,013,297 and 66,859,864 shares	670	669
Additional paid-in capital	178,952	173,976
Retained earnings	1,129,408	1,042,956
Cost of 21,296,347 and 20,411,736 shares of common stock in treasury	(886,135)	(839,517)
Accumulated other comprehensive income	366	1,370
Total shareholders' equity	423,261	379,454
Total liabilities and shareholders' equity	$ 950,932	$ 879,421