Consolidated Balance Sheets (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
CURRENT ASSETS
Cash and cash equivalents	$ 141,122	$ 121,120
Short-term investments	11,325	8,300
Trade receivables, net	44,419	41,619
Prepaid tires	12,698	6,570
Other current assets	6,587	1,725
Income tax receivable	1,447	2,052
Deferred income taxes, net	14,809	12,400
Total current assets	232,407	193,786
PROPERTY AND EQUIPMENT
Land and land improvements	17,451	17,442
Buildings	26,761	26,761
Furniture and fixtures	2,269	2,269
Shop and service equipment	7,362	6,462
Revenue equipment	353,484	333,254
Property, Plant and Equipment, Gross	407,327	386,188
Less accumulated depreciation	161,829	165,736
Property and equipment, net	245,498	220,452
LONG-TERM INVESTMENTS	53,144	80,394
GOODWILL	4,815	4,815
OTHER ASSETS	8,314	6,588
Assets	544,178	506,035
CURRENT LIABILITIES
Accounts payable and accrued liabilities	16,568	10,972
Compensation and benefits	15,805	14,823
Insurance accruals	16,248	16,341
Other accruals	8,883	6,764
Total current liabilities	57,504	48,900
LONG-TERM LIABILITIES
Income taxes payable	23,501	27,313
Deferred income taxes, net	56,869	40,917
Insurance accruals less current portion	54,367	54,718
Total long-term liabilities	134,737	122,948
COMMITMENTS AND CONTINGENCIES (Note 11)
STOCKHOLDERS' EQUITY
Preferred stock, par value $.01; authorized 5,000 shares; none issued	0	0
Capital stock, common, $.01 par value; authorized 395,000 shares; issued 90,689 in 2011 and 2010, outstanding, 88,482 and 90,689 in 2011 and 2010, respectively	907	907
Additional paid-in capital	439	439
Retained earnings	383,315	335,922
Treasury stock, at cost; 2,207 shares in 2011	(29,643)	0
Accumulated other comprehensive loss	(3,081)	(3,081)
Stockholders' Equity Attributable to Parent	351,937	334,187
Liabilities and Stockholders' Equity	$ 544,178	$ 506,035