Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 28, 2014	Dec. 28, 2013
Current Assets
Cash and cash equivalents	$ 93,133	$ 180,302
Short-term investments	36,633	34,939
Trade accounts receivable, less allowance of $4,442 and $3,773	460,079	378,732
Other receivables, including advances to independent contractors, less allowance of $3,785 and $4,253	54,615	73,903
Deferred income taxes and other current assets	28,712	14,592
Total current assets	673,172	682,468
Operating property, less accumulated depreciation and amortization of $160,434 and $157,985	175,086	177,329
Goodwill	31,134	31,134
Other assets	83,136	79,765
Total assets	962,528	970,696
Current Liabilities
Cash overdraft	27,202	27,780
Accounts payable	195,335	157,796
Current maturities of long-term debt	29,419	27,567
Insurance claims	77,909	92,280
Other current liabilities	42,285	70,237
Total current liabilities	372,150	375,660
Long-term debt, excluding current maturities	63,386	73,938
Insurance claims	23,821	24,171
Deferred income taxes and other noncurrent liabilities	43,113	42,446
Shareholders' Equity
Common stock, $0.01 par value, authorized 160,000,000 shares, issued 67,162,401 and 67,017,858 shares	672	670
Additional paid-in capital	183,681	179,807
Retained earnings	1,231,187	1,173,044
Cost of 22,471,704 and 21,528,693 shares of common stock in treasury	(955,442)	(899,028)
Accumulated other comprehensive loss	(40)	(12)
Total shareholders' equity	460,058	454,481
Total liabilities and shareholders' equity	$ 962,528	$ 970,696