Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
CURRENT ASSETS
Cash and cash equivalents	$ 16,931	$ 17,763
Trade receivables, net	91,165	84,400
Prepaid tires	7,955	6,999
Prepaid shop supplies	3,287	4,194
Other current assets	12,410	11,061
Income tax receivable	2,179	5,706
Deferred income taxes, net	13,773	14,177
Total current assets	147,700	144,300
PROPERTY AND EQUIPMENT
Land and land improvements	17,069	17,069
Buildings	27,499	27,347
Leasehold improvements	16,134	16,134
Furniture and fixtures	2,099	1,829
Shop and service equipment	10,601	10,604
Revenue equipment	564,483	549,415
Construction in progress	466	466
Property, Plant and Equipment, Gross	638,351	622,864
Less accumulated depreciation	194,612	173,605
Property and equipment, net	443,739	449,259
Goodwill	100,212	98,686
OTHER INTANGIBLES, NET	18,155	18,746
OTHER ASSETS	13,940	13,850
Assets	723,746	724,841
CURRENT LIABILITIES
Accounts payable and accrued liabilities	26,539	26,912
Compensation and benefits	27,333	28,084
Insurance accruals	20,250	20,945
Other accruals	11,860	12,627
Total current liabilities	85,982	88,568
LONG-TERM LIABILITIES
Income taxes payable	18,915	20,089
Long-term Debt, Excluding Current Maturities	62,000	75,000
Deferred income taxes, net	65,260	61,948
Insurance accruals less current portion	67,736	67,965
Other long-term liabilities	13,618	13,618
Total long-term liabilities	227,529	238,620
COMMITMENTS AND CONTINGENCIES (Note 14)
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 2014 and 2013; outstanding, 87,705 in 2014 and 2013, respectively	907	907
Additional paid-in capital	6,158	5,897
Retained earnings	444,355	432,034
Treasury stock, at cost; 2,984 shares in 2014 and 2013, respectively	(41,185)	(41,185)
Stockholders' Equity Attributable to Parent	410,235	397,653
Liabilities and Stockholders' Equity	$ 723,746	$ 724,841