Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
CURRENT ASSETS
Cash and cash equivalents	$ 16,142	$ 17,763
Trade receivables, net	88,158	84,400
Prepaid tires	9,730	6,999
Prepaid shop supplies	3,097	4,194
Other current assets	19,265	11,061
Income tax receivable	0	5,706
Deferred income taxes, net	14,310	14,177
Total current assets	150,702	144,300
PROPERTY AND EQUIPMENT
Land and land improvements	22,319	17,069
Buildings	33,196	27,347
Leasehold improvements	7,888	16,134
Furniture and fixtures	2,096	1,829
Shop and service equipment	11,455	10,604
Revenue equipment	572,079	549,415
Construction in progress	579	466
Property, Plant and Equipment, Gross	649,612	622,864
Less accumulated depreciation	180,590	173,605
Property and equipment, net	469,022	449,259
GOODWILL	100,212	98,686
OTHER INTANGIBLES, NET	17,563	18,746
OTHER ASSETS	13,899	13,850
Assets	751,398	724,841
CURRENT LIABILITIES
Accounts payable and accrued liabilities	44,077	26,912
Compensation and benefits	27,007	28,084
Insurance accruals	20,074	20,945
Other accruals	11,572	12,627
Income taxes payable	844	0
Total current liabilities	103,574	88,568
LONG-TERM LIABILITIES
Income taxes payable	17,585	20,089
Long-term debt	43,000	75,000
Deferred income taxes, net	72,184	61,948
Insurance accruals less current portion	66,203	67,965
Other long-term liabilities	13,618	13,618
Total long-term liabilities	212,590	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 87,778 in 2014 and 87,705 in 2013, respectively	907	907
Additional paid-in capital	6,443	5,897
Retained earnings	469,069	432,034
Treasury stock, at cost; 2,911 shares in 2014 and 2,984 in 2013, respectively	(41,185)	(41,185)
Stockholders' Equity Attributable to Parent	435,234	397,653
Liabilities and Stockholders' Equity	$ 751,398	$ 724,841