Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 7,817	$ 68,665
Accounts receivable, net of allowance of $2,788 in 2023 and $2,934 in 2022	143,398	119,770
Drivers' advances and other receivables, net of allowance of $593 in 2023 and $585 in 2022	3,853	3,798
Inventory and supplies	4,125	3,516
Prepaid expenses	21,345	15,746
Assets held for sale	17,924	5,956
Income taxes receivable	0	4,838
Other short-term assets	486	367
Total current assets	198,948	222,656
Property and equipment, at cost	610,799	619,686
Less: accumulated depreciation and amortization	(180,520)	(211,951)
Net property and equipment	430,279	407,735
Goodwill	68,946	58,217
Other intangibles, net	98,116	48,169
Other assets, net	73,292	58,843
Noncurrent assets of discontinued operations	925	1,025
Total assets	870,506	796,645
Current liabilities:
Checks outstanding in excess of bank balances	2,096	0
Accounts payable	33,798	33,896
Accrued expenses	57,483	58,763
Current maturities of long-term debt	26,461	18,897
Current portion of finance lease obligations	2,123	5,326
Operating lease obligations	14,247	18,179
Current portion of insurance and claims accrual	17,834	21,060
Total current liabilities	154,042	156,121
Long-term debt	163,195	90,367
Long-term portion of finance lease obligations	3,266	432
Long-term portion of operating lease obligations	39,278	46,428
Insurance and claims accrual	15,532	15,859
Deferred income taxes	99,625	98,716
Other long-term liabilities	12,204	7,494
Long-term liabilities of discontinued operations	3,700	4,100
Total liabilities	490,842	419,517
Commitments and contingent liabilities
Stockholders' equity:
Additional paid-in-capital	154,348	152,886
Treasury stock at cost; 5,529,051 and 4,918,216 shares as of June 30, 2023 and December 31, 2022, respectively	(131,402)	(106,500)
Accumulated other comprehensive income	1,042	1,086
Retained earnings	355,491	329,471
Total stockholders' equity	379,664	377,128
Total liabilities and stockholders' equity	870,506	796,645
Common Class A [Member]
Stockholders' equity:
Common stock	161	161
Common Class B [Member]
Stockholders' equity:
Common stock	$ 24	$ 24