Consolidated Condensed Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 125,949	$ 54,196
Accounts receivable, trade, less allowance of $9,539 and $9,169, respectively	449,602	460,518
Other receivables	25,907	24,449
Inventories and supplies	12,105	11,140
Prepaid taxes, licenses and permits	13,716	17,549
Other current assets	51,075	63,361
Total current assets	678,354	631,213
Property and equipment	2,600,896	2,557,825
Less – accumulated depreciation	991,296	944,582
Property and equipment, net	1,609,600	1,613,243
Goodwill	74,404	74,618
Intangible assets, net	53,956	55,315
Other non-current assets	232,712	229,324
Total assets	2,649,026	2,603,713
Current liabilities:
Accounts payable	113,657	93,987
Current portion of long-term debt	5,000	5,000
Insurance and claims accruals	66,818	72,594
Accrued payroll	50,367	44,333
Accrued expenses	30,061	28,758
Other current liabilities	24,368	24,011
Total current liabilities	290,271	268,683
Long-term debt, net of current portion	421,250	422,500
Other long-term liabilities	47,757	43,314
Insurance and claims accruals, net of current portion	241,690	237,220
Deferred income taxes	269,361	268,499
Total liabilities	1,270,329	1,240,216
Commitments and contingencies
Temporary equity:
Temporary equity - redeemable noncontrolling interest	37,233	35,947
Stockholders’ equity:
Common stock, $0.01 par value, 200,000,000 shares authorized; 80,533,536 shares issued; 65,057,763 and 65,790,112 shares outstanding, respectively	805	805
Paid-in capital	121,157	121,904
Retained earnings	1,713,046	1,667,104
Accumulated other comprehensive loss	(15,820)	(20,604)
Treasury stock, at cost; 15,475,773 and 14,743,424 shares, respectively	(477,724)	(441,659)
Total stockholders’ equity	1,341,464	1,327,550
Total liabilities, temporary equity and stockholders’ equity	$ 2,649,026	$ 2,603,713