Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 26, 2015
Current Assets
Cash and cash equivalents	$ 178,897	$ 114,520
Short-term investments	66,560	48,823
Trade accounts receivable, less allowance of $5,161 and $4,327	463,102	462,699
Other receivables, including advances to independent contractors, less allowance of $5,523 and $4,143	18,567	18,472
Other current assets	10,281	11,604
Total current assets	737,407	656,118
Operating property, less accumulated depreciation and amortization of $190,374 and $182,591	272,843	225,927
Goodwill	31,134	31,134
Other assets	55,207	78,339
Total assets	1,096,591	991,518
Current Liabilities
Cash overdraft	36,251	35,609
Accounts payable	219,409	223,709
Current maturities of long-term debt	45,047	42,499
Insurance claims	26,121	19,757
Other current liabilities	53,483	47,963
Total current liabilities	380,311	369,537
Long-term debt, excluding current maturities	93,257	81,793
Insurance claims	26,883	21,477
Deferred income taxes and other noncurrent liabilities	53,583	52,474
Shareholders' Equity
Common stock, $0.01 par value, authorized 160,000,000 shares, issued 67,585,675 and 67,391,616 shares	676	674
Additional paid-in capital	199,414	195,841
Retained earnings	1,512,993	1,389,975
Cost of 25,747,541 and 24,972,079 shares of common stock in treasury	(1,167,437)	(1,116,765)
Accumulated other comprehensive loss	(3,089)	(3,488)
Total shareholders' equity	542,557	466,237
Total liabilities and shareholders' equity	$ 1,096,591	$ 991,518