Consolidated Balance Sheets (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
CURRENT ASSETS
Cash and cash equivalents	$ 151,417	$ 121,120
Short-term investments	2,550	8,300
Trade receivables, net	46,887	41,619
Prepaid tires	12,728	6,570
Other current assets	11,581	1,725
Income tax receivable	876	2,052
Deferred income taxes, net	14,098	12,400
Total current assets	240,137	193,786
PROPERTY AND EQUIPMENT
Land and land improvements	17,442	17,442
Buildings	26,761	26,761
Furniture and fixtures	2,269	2,269
Shop and service equipment	7,371	6,462
Revenue equipment	341,930	333,254
Property, Plant and Equipment, Gross	395,773	386,188
Less accumulated depreciation	158,933	165,736
Property and equipment, net	236,840	220,452
LONG-TERM INVESTMENTS	64,494	80,394
GOODWILL	4,815	4,815
OTHER ASSETS	8,057	6,588
Assets	554,343	506,035
CURRENT LIABILITIES
Accounts payable and accrued liabilities	15,470	10,972
Compensation and benefits	17,915	14,823
Insurance accruals	16,200	16,341
Other accruals	7,354	6,764
Total current liabilities	56,939	48,900
LONG-TERM LIABILITIES
Income taxes payable	23,067	27,313
Deferred income taxes, net	52,148	40,917
Insurance accruals less current portion	54,218	54,718
Total long-term liabilities	129,433	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 and outstanding 90,689 in 2011 and 2010	907	907
Additional paid-in capital	439	439
Retained earnings	369,706	335,922
Accumulated other comprehensive loss	(3,081)	(3,081)
Stockholders' Equity Attributable to Parent	367,971	334,187
Liabilities and Stockholders' Equity	$ 554,343	$ 506,035