Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Current Assets:
Cash and cash equivalents	$ 12,308	$ 296,215
Accounts receivable, net	345,808	311,742
Prepaid expenses	51,231	32,648
Other current assets	6,913	8,089
Total current assets	416,260	648,694
Property and Equipment, at cost	3,336,493	2,881,800
Less: accumulated depreciation and amortization	1,159,629	1,118,492
Net property and equipment	2,176,864	1,763,308
Operating Lease Right-of-Use Assets	129,520	118,734
Goodwill and Identifiable Intangibles, net	17,082	17,296
Other Noncurrent Assets	25,988	35,533
Total assets	2,765,714	2,583,565
Current Liabilities:
Accounts payable	153,487	141,877
Wages, vacation and employees’ benefits	55,318	75,514
Claims and insurance accruals	36,612	41,641
Other current liabilities	58,331	27,094
Current portion of long-term debt	7,498	10,173
Current portion of operating lease liability	26,526	25,757
Total current liabilities	337,772	322,056
Other Liabilities:
Long-term debt, less current portion	76,553	6,315
Operating lease liability, less current portion	98,190	96,462
Deferred income taxes	157,626	155,841
Claims, insurance and other	66,635	61,397
Total other liabilities	399,004	320,015
Commitments and Contingencies (Note 3)
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, 26,588,162 and 26,549,372 shares issued and outstanding at March 31, 2024 and December 31, 2023, respectively	27	27
Additional paid-in-capital	282,090	285,092
Deferred compensation trust, 69,412 and 69,672 shares of common stock at cost at March 31, 2024 and December 31, 2023, respectively	(5,928)	(5,679)
Retained earnings	1,752,749	1,662,054
Total stockholders’ equity	2,028,938	1,941,494
Total liabilities and stockholders’ equity	$ 2,765,714	$ 2,583,565