Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
CURRENT ASSETS
Cash and cash equivalents	$ 17,763	$ 119,838
Trade receivables, net	84,400	46,555
Prepaid tires	6,999	6,603
Prepaid shop supplies	4,194	0
Other current assets	11,061	2,281
Income tax receivable	5,706	2,351
Deferred income taxes, net	14,177	13,797
Total current assets	144,300	191,425
PROPERTY AND EQUIPMENT
Land and land improvements	17,069	17,451
Buildings	27,347	26,761
Leasehold improvements	16,134	0
Furniture and fixtures	1,829	2,269
Shop and service equipment	10,604	7,266
Revenue equipment	549,415	378,583
Construction in progress	466	0
Property, Plant and Equipment, Gross	622,864	432,330
Less accumulated depreciation	173,605	189,959
Property and equipment, net	449,259	242,371
LONG-TERM INVESTMENTS	0	20,016
Goodwill	98,686	4,815
OTHER INTANGIBLES, NET	18,746	0
OTHER ASSETS	13,850	9,110
Assets	724,841	467,737
CURRENT LIABILITIES
Accounts payable and accrued liabilities	26,912	7,583
Compensation and benefits	28,084	16,409
Insurance accruals	20,945	13,924
Other accruals	12,627	7,439
Total current liabilities	88,568	45,355
LONG-TERM LIABILITIES
Income taxes payable	20,089	23,122
Long-term Debt	75,000
Long-term Debt, Excluding Current Maturities	75,000	0
Deferred income taxes, net	61,948	51,306
Insurance accruals less current portion	67,965	57,590
Other long-term liabilities	13,618	0
Total long-term liabilities	238,620	132,018
COMMITMENTS AND CONTINGENCIES (Note 9)
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 2012 and 2011; outstanding, 84,770 and 86,475 in 2012 and 2011, respectively	907	907
Additional paid-in capital	5,897	2,968
Retained earnings	432,034	368,313
Treasury stock, at cost; 5,919 and 4,214 shares in 2012 and 2011, respectively	(41,185)	(80,540)
Accumulated other comprehensive loss	0	(1,284)
Stockholders' Equity Attributable to Parent	397,653	290,364
Liabilities and Stockholders' Equity	$ 724,841	$ 467,737