Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
CURRENT ASSETS
Cash and cash equivalents	$ 106,402	$ 75,378
Trade receivables, net of allowance of $1.5 million and $1.5 million	58,483	64,293
Prepaid tires	9,900	10,989
Other current assets	17,032	13,782
Income tax receivable	4,361	6,393
Total current assets	196,178	170,835
PROPERTY AND EQUIPMENT
Land and land improvements	40,917	40,283
Buildings	50,583	48,657
Leasehold improvements	1,097	2,208
Furniture and fixtures	2,808	3,437
Shop and service equipment	13,385	12,202
Revenue equipment	520,917	555,980
Construction in progress	6,584	3,996
Property, Plant and Equipment, Gross	636,291	666,763
Less accumulated depreciation	219,637	223,901
Property and equipment, net	416,654	442,862
GOODWILL	132,410	132,410
OTHER INTANGIBLES, NET	15,700	17,022
Deferred Income Taxes, Net	3,173	1,737
OTHER ASSETS	21,141	24,261
Assets	785,256	789,127
CURRENT LIABILITIES
Accounts payable and accrued liabilities	11,823	14,366
Compensation and benefits	24,692	26,752
Insurance accruals	19,165	21,368
Other accruals	12,665	12,835
Total current liabilities	68,345	75,321
LONG-TERM LIABILITIES
Income taxes payable	4,829	8,147
Deferred income taxes, net	71,291	65,488
Insurance accruals less current portion	59,002	65,526
Total long-term liabilities	135,122	139,161
COMMITMENTS AND CONTINGENCIES (Note 15)
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 2018 and 2017; outstanding 82,151 in 2018 and 83,303 in 2017	907	907
Additional paid-in capital	3,462	3,518
Retained earnings	722,045	694,174
Treasury stock, at cost; 8,538 shares in 2018 and 7,386 in 2017	(144,625)	(123,954)
Stockholders' Equity Attributable to Parent	581,789	574,645
Liabilities and Stockholders' Equity	$ 785,256	$ 789,127