Consolidated Condensed Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 40,476	$ 26,418
Accounts receivable, trade, less allowance of $8,854 and $7,921, respectively	337,897	322,846
Other receivables	28,937	52,221
Inventories and supplies	9,354	9,243
Prepaid taxes, licenses and permits	7,328	16,757
Other current assets	40,129	38,849
Total current assets	464,121	466,334
Property and equipment	2,384,537	2,343,536
Less – accumulated depreciation	857,106	817,260
Property and equipment, net	1,527,431	1,526,276
Other non-current assets	148,584	151,254
Total assets	2,140,136	2,143,864
Current liabilities:
Accounts payable	104,041	94,634
Current portion of long-term debt	0	75,000
Insurance and claims accruals	81,024	69,810
Accrued payroll	42,885	38,347
Other current liabilities	28,258	31,049
Total current liabilities	256,208	308,840
Long-term debt, net of current portion	175,000	225,000
Other long-term liabilities	48,362	21,129
Insurance and claims accruals, net of current portion	234,797	228,218
Deferred income taxes	245,632	249,669
Commitments and contingencies
Stockholders’ equity:
Common stock, $0.01 par value, 200,000,000 shares authorized; 80,533,536 shares issued; 69,097,926 and 69,244,525 shares outstanding, respectively	805	805
Paid-in capital	114,074	112,649
Retained earnings	1,384,474	1,294,608
Accumulated other comprehensive loss	(28,729)	(14,728)
Treasury stock, at cost; 11,435,610 and 11,289,011 shares, respectively	(290,487)	(282,326)
Total stockholders’ equity	1,180,137	1,111,008
Total liabilities and stockholders’ equity	$ 2,140,136	$ 2,143,864