Consolidated Condensed Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 65,389	$ 26,418
Accounts receivable, trade, less allowance of $8,720 and $7,921, respectively	299,383	322,846
Other receivables	24,060	52,221
Inventories and supplies	8,713	9,243
Prepaid taxes, licenses and permits	7,900	16,757
Other current assets	26,142	38,849
Total current assets	431,587	466,334
Property and equipment	2,368,543	2,343,536
Less – accumulated depreciation	868,379	817,260
Property and equipment, net	1,500,164	1,526,276
Other non-current assets	147,962	151,254
Total assets	2,079,713	2,143,864
Current liabilities:
Accounts payable	84,263	94,634
Current portion of long-term debt	0	75,000
Insurance and claims accruals	80,857	69,810
Accrued payroll	42,199	38,347
Income taxes payable	15,706	0
Other current liabilities	26,598	31,049
Total current liabilities	249,623	308,840
Long-term debt, net of current portion	175,000	225,000
Other long-term liabilities	39,338	21,129
Insurance and claims accruals, net of current portion	234,819	228,218
Deferred income taxes	244,545	249,669
Commitments and contingencies
Stockholders’ equity:
Common stock, $0.01 par value, 200,000,000 shares authorized; 80,533,536 shares issued; 69,097,033 and 69,244,525 shares outstanding, respectively	805	805
Paid-in capital	111,634	112,649
Retained earnings	1,344,361	1,294,608
Accumulated other comprehensive loss	(29,912)	(14,728)
Treasury stock, at cost; 11,436,503 and 11,289,011 shares, respectively	(290,500)	(282,326)
Total stockholders’ equity	1,136,388	1,111,008
Total liabilities and stockholders’ equity	$ 2,079,713	$ 2,143,864