Consolidated Condensed Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 72,237	$ 26,418
Accounts receivable, trade, less allowance of $8,678 and $7,921, respectively	310,900	322,846
Other receivables	22,575	52,221
Inventories and supplies	8,151	9,243
Prepaid taxes, licenses and permits	12,757	16,757
Other current assets	33,023	38,849
Total current assets	459,643	466,334
Property and equipment	2,325,615	2,343,536
Less – accumulated depreciation	846,871	817,260
Property and equipment, net	1,478,744	1,526,276
Other non-current assets	150,511	151,254
Total assets	2,088,898	2,143,864
Current liabilities:
Accounts payable	87,698	94,634
Current portion of long-term debt	75,000	75,000
Insurance and claims accruals	72,987	69,810
Accrued payroll	37,650	38,347
Other current liabilities	31,336	31,049
Total current liabilities	304,671	308,840
Long-term debt, net of current portion	175,000	225,000
Other long-term liabilities	28,186	21,129
Insurance and claims accruals, net of current portion	234,191	228,218
Deferred income taxes	244,814	249,669
Commitments and contingencies
Stockholders’ equity:
Common stock, $0.01 par value, 200,000,000 shares authorized; 80,533,536 shares issued; 69,086,736 and 69,244,525 shares outstanding, respectively	805	805
Paid-in capital	110,695	112,649
Retained earnings	1,311,448	1,294,608
Accumulated other comprehensive loss	(30,218)	(14,728)
Treasury stock, at cost; 11,446,800 and 11,289,011 shares, respectively	(290,694)	(282,326)
Total stockholders’ equity	1,102,036	1,111,008
Total liabilities and stockholders’ equity	$ 2,088,898	$ 2,143,864