Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
CURRENT ASSETS
Cash and cash equivalents	$ 180,366	$ 113,852
Trade receivables, net of $1.1 million allowance in 2021 and 2020, respectively	58,538	55,577
Prepaid tires	9,272	8,241
Other current assets	10,398	15,342
Total current assets	258,574	193,012
PROPERTY AND EQUIPMENT
Land and land improvements	83,698	77,525
Buildings	89,375	86,712
Furniture and fixtures	5,282	4,807
Shop and service equipment	14,404	14,380
Revenue equipment	518,505	590,153
Construction in progress	14,238	5,783
Property, Plant and Equipment, Gross	725,502	779,360
Less accumulated depreciation	234,444	240,080
Property and equipment, net	491,058	539,280
GOODWILL	168,295	168,295
OTHER INTANGIBLES, NET	22,953	24,746
OTHER ASSETS	17,400	17,679
Deferred Income Taxes, Net	0	8,164
Assets	958,280	951,176
CURRENT LIABILITIES
Accounts payable and accrued liabilities	14,430	12,751
Dividends Payable, Current	41,095	0
Compensation and benefits	24,355	22,422
Insurance accruals	13,645	15,837
Other Accrued Liabilities	19,001	18,557
Accrued Income Taxes, Current	4,513	1,475
Total current liabilities	117,039	71,042
LONG-TERM LIABILITIES
Income taxes payable	5,385	5,801
Deferred Tax and Other Liabilities, Noncurrent	87,217	104,004
Insurance accruals less current portion	39,823	45,995
Total long-term liabilities	132,425	155,800
COMMITMENTS AND CONTINGENCIES (Note 13)
STOCKHOLDERS' EQUITY
Preferred Stock, Value, Issued	0	0
Capital stock, common, $.01 par value; authorized 395,000 shares; issued 90,689 in 2021 and 2020; outstanding 78,943 and 80,653 in 2021 and 2020, respectively	907	907
Additional paid-in capital	4,319	4,330
Retained earnings	905,620	890,970
Treasury stock, at cost; 11,746 and 10,036 shares in 2021 and 2020, respectively	(202,030)	(171,873)
Stockholders' Equity Attributable to Parent	708,816	724,334
Liabilities and Stockholders' Equity	$ 958,280	$ 951,176