Consolidated Balance Sheets - USD ($) $ in Thousands	Apr. 01, 2017	Dec. 31, 2016
Current Assets
Cash and cash equivalents	$ 215,468	$ 178,897
Short-term investments	62,058	66,560
Trade accounts receivable, less allowance of $5,524 and $5,161	439,510	463,102
Other receivables, including advances to independent contractors, less allowance of $5,706 and $5,523	23,875	18,567
Other current assets	8,095	10,281
Total current assets	749,006	737,407
Operating property, less accumulated depreciation and amortization of $195,581 and $190,374	263,375	272,843
Goodwill	31,134	31,134
Other assets	62,627	55,207
Total assets	1,106,142	1,096,591
Current Liabilities
Cash overdraft	29,373	36,251
Accounts payable	200,675	219,409
Current maturities of long-term debt	42,909	45,047
Insurance claims	28,859	26,121
Accrued income taxes	19,430	5,437
Other current liabilities	47,391	48,046
Total current liabilities	368,637	380,311
Long-term debt, excluding current maturities	82,987	93,257
Insurance claims	27,847	26,883
Deferred income taxes and other noncurrent liabilities	52,928	53,583
Shareholders' Equity
Common stock, $0.01 par value, authorized 160,000,000 shares, issued 67,671,338 and 67,585,675 shares	677	676
Additional paid-in capital	201,948	199,414
Retained earnings	1,541,606	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	(2,888)	(3,089)
Total shareholders' equity	573,743	542,557
Total liabilities and shareholders' equity	$ 1,106,142	$ 1,096,591