Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 27, 2014	Dec. 28, 2013
Current Assets
Cash and cash equivalents	$ 140,591	$ 180,302
Short-term investments	37,664	34,939
Trade accounts receivable, less allowance of $4,687 and $3,773	455,478	378,732
Other receivables, including advances to independent contractors, less allowance of $3,449 and $4,253	12,355	73,903
Deferred income taxes and other current assets	16,322	14,592
Total current assets	662,410	682,468
Operating property, less accumulated depreciation and amortization of $157,379 and $157,985	203,568	177,329
Goodwill	31,134	31,134
Other assets	83,113	79,765
Total assets	980,225	970,696
Current Liabilities
Cash overdraft	32,232	27,780
Accounts payable	203,203	157,796
Current maturities of long-term debt	34,619	27,567
Insurance claims	29,153	92,280
Other current liabilities	43,120	70,237
Total current liabilities	342,327	375,660
Long-term debt, excluding current maturities	80,507	73,938
Insurance claims	23,293	24,171
Deferred income taxes and other noncurrent liabilities	38,426	42,446
Shareholders' Equity
Common stock, $0.01 par value, authorized 160,000,000 shares, issued 67,211,626 and 67,017,858 shares	672	670
Additional paid-in capital	186,097	179,807
Retained earnings	1,264,811	1,173,044
Cost of 22,474,331 and 21,528,693 shares of common stock in treasury	(955,613)	(899,028)
Accumulated other comprehensive loss	(295)	(12)
Total shareholders' equity	495,672	454,481
Total liabilities and shareholders' equity	$ 980,225	$ 970,696