Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents	$ 4,368	$ 5,505
Customer receivables, net of allowance of $153 and $157 at March 31, 2021 and December 31, 2020, respectively	214,601	189,869
Other receivables	17,550	19,203
Prepaid insurance and licenses	17,736	14,265
Operating supplies	10,165	8,953
Assets held for sale	16,040	12,382
Other current assets	18,015	16,263
Total current assets	298,475	266,440
Property and equipment, at cost	894,774	896,264
Less accumulated depreciation and amortization	(416,550)	(394,603)
Net property and equipment	478,224	501,661
Other assets
Operating lease right of use assets	271,175	287,251
Goodwill	59,221	59,221
Intangible assets, net	25,125	25,513
Other	39,420	39,504
Total other assets	394,941	411,489
Total assets	1,171,640	1,179,590
Current liabilities
Accounts payable	96,548	83,621
Book overdraft	2,584
Accrued wages and benefits	41,789	40,095
Claims and insurance accruals, current	51,238	47,667
Other accrued liabilities	5,731	5,986
Current portion of operating lease liabilities	76,397	78,193
Current maturities of long-term debt and finance leases	91,224	103,690
Total current liabilities	365,511	359,252
Long-term debt and finance leases, net of current maturities	251,056	255,287
Less unamortized discount and debt issuance costs	(393)	(314)
Net long-term debt and finance leases	250,663	254,973
Deferred income taxes	26,403	25,162
Other long-term liabilities	14,652	14,615
Claims and insurance accruals, long-term	53,680	55,420
Noncurrent operating lease liabilities	195,456	209,311
Commitments and contingencies (Note 7)
Stockholders' equity
Additional paid-in capital	263,090	261,338
Retained Earnings (Deficit)	108	(2,430)
Stockholders' equity	263,700	259,405
Noncontrolling interest	1,575	1,452
Total stockholders' equity	265,275	260,857
Total liabilities and stockholders' equity	1,171,640	1,179,590
Class A common stock
Stockholders' equity
Common stock	345	340
Common Class B [Member]
Stockholders' equity
Common stock	$ 157	$ 157