Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Current Assets:
Cash and cash equivalents	$ 11,169	$ 296,215
Accounts receivable, net	375,868	311,742
Prepaid expenses	42,762	32,648
Income tax receivable	7,165	0
Other current assets	9,097	8,089
Total current assets	446,061	648,694
Property and Equipment, at cost	3,535,457	2,881,800
Less: accumulated depreciation and amortization	1,194,231	1,118,492
Net property and equipment	2,341,226	1,763,308
Operating Lease Right-of-Use Assets	127,441	118,734
Goodwill and Identifiable Intangibles, net	16,869	17,296
Other Noncurrent Assets	25,525	35,533
Total assets	2,957,122	2,583,565
Current Liabilities:
Accounts payable	155,590	141,877
Wages, vacation and employees’ benefits	62,614	75,514
Claims and insurance accruals	39,682	41,641
Other current liabilities	36,303	27,094
Current portion of long-term debt	7,577	10,173
Current portion of operating lease liability	26,062	25,757
Total current liabilities	327,828	322,056
Other Liabilities:
Long-term debt, less current portion	169,098	6,315
Operating lease liability, less current portion	97,480	96,462
Deferred income taxes	159,925	155,841
Claims, insurance and other	66,705	61,397
Total other liabilities	493,208	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, 26,589,913 and 26,549,372 shares issued and outstanding at June 30, 2024 and December 31, 2023 , respectively	27	27
Additional paid-in-capital	287,611	285,092
Deferred compensation trust, 71,302 and 69,672 shares of common stock at cost at June 30, 2024 and December 31, 2023 , respectively	(6,820)	(5,679)
Retained earnings	1,855,268	1,662,054
Total stockholders’ equity	2,136,086	1,941,494
Total liabilities and stockholders’ equity	$ 2,957,122	$ 2,583,565