Consolidated Balance Sheets - USD ($) $ in Thousands	Jul. 01, 2017	Dec. 31, 2016
Current Assets
Cash and cash equivalents	$ 222,102	$ 178,897
Short-term investments	51,167	66,560
Trade accounts receivable, less allowance of $5,311 and $5,161	480,467	463,102
Other receivables, including advances to independent contractors, less allowance of $6,049 and $5,523	20,518	18,567
Other current assets	19,291	10,281
Total current assets	793,545	737,407
Operating property, less accumulated depreciation and amortization of $202,050 and $190,374	259,346	272,843
Goodwill	31,134	31,134
Other assets	75,249	55,207
Total assets	1,159,274	1,096,591
Current Liabilities
Cash overdraft	34,145	36,251
Accounts payable	224,928	219,409
Current maturities of long-term debt	41,356	45,047
Insurance claims	29,077	26,121
Other current liabilities	56,998	53,483
Total current liabilities	386,504	380,311
Long-term debt, excluding current maturities	77,639	93,257
Insurance claims	30,402	26,883
Deferred income taxes and other noncurrent liabilities	55,239	53,583
Shareholders' Equity
Common stock, $0.01 par value, authorized 160,000,000 shares, issued 67,696,487 and 67,585,675 shares	677	676
Additional paid-in capital	203,410	199,414
Retained earnings	1,575,342	1,512,993
Cost of 25,749,493 and 25,747,541 shares of common stock in treasury	(1,167,600)	(1,167,437)
Accumulated other comprehensive loss	(2,339)	(3,089)
Total shareholders' equity	609,490	542,557
Total liabilities and shareholders' equity	$ 1,159,274	$ 1,096,591