Unaudited Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets
Cash and cash equivalents	$ 3,145	$ 5,695
Customer receivables, net of allowance of $44 and $11 at June 30, 2022 and December 31, 2021, respectively	247,721	231,687
Other receivables	18,800	18,046
Prepaid insurance and licenses	11,654	13,867
Operating supplies	10,613	9,550
Assets held for sale	16,713	11,831
Other current assets	28,058	32,020
Total current assets	336,704	322,696
Property and equipment, at cost	927,939	890,933
Less accumulated depreciation and amortization	(377,926)	(370,112)
Net property and equipment	550,013	520,821
Other assets
Operating lease right of use assets	292,373	292,347
Goodwill	59,221	59,221
Intangible assets, net	23,956	24,129
Other	48,862	50,829
Total other assets	424,412	426,526
Total assets	1,311,129	1,270,043
Current liabilities
Accounts payable	124,768	126,910
Book overdraft	4,438	7,096
Accrued wages and benefits	51,010	45,011
Claims and insurance accruals, current	46,042	44,309
Other accrued liabilities	5,550	5,962
Current portion of operating lease liabilities	92,833	88,375
Current maturities of long-term debt and finance leases	113,599	85,117
Total current liabilities	438,240	402,780
Liabilities, Noncurrent [Abstract]
Long-term debt and finance leases, net of current maturities	308,069	290,392
Less unamortized discount and debt issuance costs	(333)	(357)
Net long-term debt and finance leases	307,736	290,035
Deferred income taxes	21,384	24,301
Other long-term liabilities	25,431	14,457
Claims and insurance accruals, long-term	43,933	54,819
Noncurrent operating lease liabilities	201,784	205,362
Commitments and contingencies (Note 7)
Stockholders' equity
Additional paid-in capital	270,873	267,621
Retained earnings (deficit)	(1,016)	8,440
Stockholders' equity	270,369	276,566
Noncontrolling interest	2,252	1,723
Total stockholders' equity	272,621	278,289
Total liabilities and stockholders' equity	1,311,129	1,270,043
Common Stock Class A
Stockholders' equity
Common stock	354	348
Common Stock Class B
Stockholders' equity
Common stock	$ 158	$ 157