Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
CURRENT ASSETS
Cash and cash equivalents	$ 157,742	$ 113,852
Trade receivables, net	52,812	55,577
Prepaid tires	9,168	8,241
Other current assets	9,406	15,342
Income tax receivable	4,095	0
Total current assets	233,223	193,012
PROPERTY AND EQUIPMENT
Land and land improvements	90,218	77,525
Buildings	95,305	86,712
Furniture and fixtures	5,365	4,807
Shop and service equipment	15,727	14,380
Revenue equipment	500,311	590,153
Construction in progress	3,834	5,783
Property and equipment, gross	710,760	779,360
Less accumulated depreciation	222,845	240,080
Property and equipment, net	487,915	539,280
GOODWILL	168,295	168,295
OTHER INTANGIBLES, NET	22,355	24,746
DEFERRED INCOME TAX ASSETS, NET	0	8,164
OTHER ASSETS	16,754	17,679
Assets	928,542	951,176
CURRENT LIABILITIES
Accounts payable and accrued liabilities	20,538	12,751
Compensation and benefits	21,411	22,422
Insurance accruals	15,677	15,837
Other accruals	13,968	18,557
Income taxes payable	0	1,475
Total current liabilities	71,594	71,042
LONG-TERM LIABILITIES
Income taxes payable	5,491	5,801
Deferred income taxes, net	89,971	104,004
Insurance accruals less current portion	34,384	45,995
Total long-term liabilities	129,846	155,800
COMMITMENTS AND CONTINGENCIES (Note 12)
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 2021 and 2020; outstanding 78,923 and 80,653 in 2021 and 2020, respectively	907	907
Additional paid-in capital	4,141	4,330
Retained earnings	924,375	890,970
Treasury stock, at cost; 11,766 and 10,036 shares in 2021 and 2020, respectively	(202,321)	(171,873)
Stockholders' Equity Attributable to Parent	727,102	724,334
Liabilities and Stockholders' Equity	$ 928,542	$ 951,176