Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
CURRENT ASSETS
Cash and cash equivalents	$ 17,303	$ 17,763
Trade receivables, net	77,034	84,400
Prepaid tires	10,160	6,999
Prepaid shop supplies	2,056	4,194
Other current assets	8,992	11,061
Income tax receivable	19,920	5,706
Deferred income taxes, net	14,767	14,177
Total current assets	150,232	144,300
PROPERTY AND EQUIPMENT
Land and land improvements	22,463	17,069
Buildings	34,151	27,347
Leasehold improvements	8,033	16,134
Furniture and fixtures	2,096	1,829
Shop and service equipment	10,820	10,604
Revenue equipment	600,335	549,415
Construction in progress	668	466
Property and equipment, gross	678,566	622,864
Less accumulated depreciation	198,007	173,605
Property and equipment, net	480,559	449,259
Goodwill	100,212	98,686
OTHER INTANGIBLES, NET	16,380	18,746
OTHER ASSETS	12,611	13,850
Assets	759,994	724,841
CURRENT LIABILITIES
Accounts payable and accrued liabilities	8,261	26,912
Compensation and benefits	26,303	28,084
Insurance accruals	19,249	20,945
Other accruals	14,475	12,627
Total current liabilities	68,288	88,568
LONG-TERM LIABILITIES
Income taxes payable	18,296	20,089
Long-term debt	24,600	75,000
Deferred income taxes, net	101,605	61,948
Insurance accruals less current portion	59,300	67,965
Other long-term liabilities	11,318	13,618
Total long-term liabilities	215,119	238,620
COMMITMENTS AND CONTINGENCIES (Note 13)
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 87,781 and 87,705 in 2014 and 2013, respectively	907	907
Additional paid-in capital	4,058	5,897
Retained earnings	509,834	432,034
Treasury stock, at cost; 2,908 and 2,984 shares in 2014 and 2013, respectively	(38,212)	(41,185)
Stockholders' Equity Attributable to Parent	476,587	397,653
Liabilities and Stockholders' Equity	$ 759,994	$ 724,841