Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Current Assets:
Cash and cash equivalents	$ 187,390	$ 106,588
Accounts receivable, less allowances of $5,804 in 2022 and $5,530 in 2021	290,306	276,755
Prepaid expenses	22,525	20,329
Income tax receivable	23,438
Other current assets	7,227	12,583
Total current assets	530,886	416,255
Property and Equipment, at cost	2,478,824	2,144,528
Less-accumulated depreciation and amortization	996,204	864,074
Net property and equipment	1,482,620	1,280,454
Operating Lease Right-of-Use Assets	120,455	107,781
Goodwill and Identifiable Intangibles, net	18,149	19,157
Other Noncurrent Assets	22,600	21,603
Total assets	2,174,710	1,845,250
Current Liabilities:
Accounts payable	99,792	114,010
Wages, vacation and employees’ benefits	66,684	73,109
Claims and insurance accruals	45,481	54,717
Other current liabilities	22,684	38,551
Current portion of long-term debt	14,519	19,396
Current portion of operating lease liability	24,925	21,565
Total current liabilities	274,085	321,348
Other Liabilities:
Long-term debt, less current portion	16,489	31,008
Operating lease liability, less current portion	98,581	88,409
Deferred income taxes	145,771	124,137
Claims, insurance and other	60,443	60,015
Total other liabilities	321,284	303,569
Stockholders’ Equity:
Preferred stock, $0.001 par value, 50,000 shares authorized, none issued and outstanding	0	0
Common stock, $0.001 par value, 100,000,000 shares authorized, 26,464,197 and 26,336,589 shares issued and outstanding at December 31, 2022 and 2021, respectively	26	26
Additional paid-in-capital	277,366	274,633
Deferred compensation trust, 69,982 and 94,627 shares of common stock at cost at December 31, 2022 and 2021, respectively	(5,248)	(4,101)
Retained earnings	1,307,197	949,775
Total stockholders’ equity	1,579,341	1,220,333
Total liabilities and stockholders’ equity	$ 2,174,710	$ 1,845,250