Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
CURRENT ASSETS
Cash and cash equivalents	$ 171,879	$ 157,742
Trade receivables, net of $1.3 and $1.1 million allowance in 2022 and 2021, respectively	95,712	52,812
Prepaid tires	8,570	9,168
Other current assets	19,955	9,406
Income Taxes Receivable, Current	0	4,095
Total current assets	296,116	233,223
PROPERTY AND EQUIPMENT
Land and land improvements	71,458	90,218
Buildings	98,877	95,305
Furniture and fixtures	5,187	5,365
Shop and service equipment	16,737	15,727
Revenue equipment	548,541	500,311
Construction in progress	8,951	3,834
Property, Plant and Equipment, Gross	749,751	710,760
Less accumulated depreciation	238,944	222,845
Property and equipment, net	510,807	487,915
GOODWILL	208,800	168,295
OTHER INTANGIBLES, NET	49,230	22,355
OTHER ASSETS	19,454	16,754
Operating Lease, Right-of-Use Asset	28,796	0
Assets	1,113,203	928,542
CURRENT LIABILITIES
Accounts payable and accrued liabilities	28,804	20,538
Compensation and benefits	27,778	21,411
Insurance accruals	15,859	15,677
Long-term Debt, Current Maturities	2,304	0
Operating Lease, Liability, Current	14,318	0
Finance Lease, Liability, Current	7,544	0
Other Accrued Liabilities	16,410	13,968
Accrued Income Taxes, Current	13,335	0
Total current liabilities	126,352	71,594
LONG-TERM LIABILITIES
Income taxes payable	6,461	5,491
Long-term Debt, Excluding Current Maturities	8,623	0
Operating Lease, Liability, Noncurrent	14,478	0
Finance Lease, Liability, Noncurrent	27,199	0
Deferred Tax and Other Liabilities, Noncurrent	77,262	89,971
Insurance accruals less current portion	34,926	34,384
Total long-term liabilities	168,949	129,846
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 2022 and 2021; outstanding 78,936 and 78,923 in 2022 and 2021, respectively	907	907
Additional paid-in capital	4,191	4,141
Retained earnings	1,014,898	924,375
Treasury stock, at cost; 11,753 and 11,766 in 2022 and 2021, respectively	(202,094)	(202,321)
Stockholders' Equity Attributable to Parent	817,902	727,102
Liabilities and Stockholders' Equity	$ 1,113,203	$ 928,542