Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
CURRENT ASSETS
Cash and cash equivalents	$ 205,642	$ 161,448
Trade receivables, net of allowance of $0.9 million and $0.9 million	53,643	48,955
Prepaid tires	9,217	9,378
Other current assets	11,980	12,551
Income tax receivable	0	170
Total current assets	280,482	232,502
PROPERTY AND EQUIPMENT
Land and land improvements	54,726	46,095
Buildings	61,011	57,505
Leasehold improvements	437	437
Furniture and fixtures	3,093	3,057
Shop and service equipment	12,172	10,968
Revenue equipment	488,301	479,068
Construction in progress	5,627	6,540
Property, Plant and Equipment, Gross	625,367	603,670
Less accumulated depreciation	214,566	200,550
Property and equipment, net	410,801	403,120
GOODWILL	132,410	132,410
OTHER INTANGIBLES, NET	13,290	14,494
Deferred Income Taxes, Net	5,211	4,535
OTHER ASSETS	17,643	19,152
Assets	859,837	806,213
CURRENT LIABILITIES
Accounts payable and accrued liabilities	23,785	10,552
Compensation and benefits	20,916	22,558
Insurance accruals	21,027	22,130
Other accruals	10,470	9,449
Accrued Income Taxes, Current	617	0
Total current liabilities	76,815	64,689
LONG-TERM LIABILITIES
Income taxes payable	5,736	5,577
Deferred income taxes, net	76,138	71,041
Insurance accruals less current portion	47,819	48,934
Total long-term liabilities	129,693	125,552
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 2019 and 2018; outstanding 81,968 in 2019 and 81,930 in 2018	907	907
Additional paid-in capital	3,799	3,454
Retained earnings	796,661	760,262
Treasury stock, at cost; 8,721 shares in 2019 and 8,759 in 2018	(148,038)	(148,651)
Stockholders' Equity Attributable to Parent	653,329	615,972
Liabilities and Stockholders' Equity	$ 859,837	$ 806,213