Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
CURRENT ASSETS
Cash and cash equivalents	$ 176,303	$ 161,448
Trade receivables, net of allowance of $0.9 million and $0.9 million	53,279	48,955
Prepaid tires	10,521	9,378
Other current assets	13,171	12,551
Income tax receivable	0	170
Total current assets	253,274	232,502
PROPERTY AND EQUIPMENT
Land and land improvements	53,518	46,095
Buildings	60,739	57,505
Leasehold improvements	437	437
Furniture and fixtures	3,093	3,057
Shop and service equipment	12,150	10,968
Revenue equipment	489,599	479,068
Construction in progress	2,235	6,540
Property, Plant and Equipment, Gross	621,771	603,670
Less accumulated depreciation	211,516	200,550
Property and equipment, net	410,255	403,120
GOODWILL	132,410	132,410
OTHER INTANGIBLES, NET	13,892	14,494
Deferred Income Taxes, Net	4,774	4,535
OTHER ASSETS	18,330	19,152
Assets	832,935	806,213
CURRENT LIABILITIES
Accounts payable and accrued liabilities	16,586	10,552
Compensation and benefits	22,659	22,558
Insurance accruals	21,123	22,130
Other accruals	11,552	9,449
Taxes Payable, Current	2,010	0
Total current liabilities	73,930	64,689
LONG-TERM LIABILITIES
Income taxes payable	5,317	5,577
Deferred income taxes, net	73,795	71,041
Insurance accruals less current portion	48,066	48,934
Total long-term liabilities	127,178	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 81,943 in 2019 and 81,930 in 2018	907	907
Additional paid-in capital	3,424	3,454
Retained earnings	775,940	760,262
Treasury stock, at cost; 8,746 shares in 2019 and 8,759 in 2018	(148,444)	(148,651)
Stockholders' Equity Attributable to Parent	631,827	615,972
Liabilities and Stockholders' Equity	$ 832,935	$ 806,213