Consolidated Condensed Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 14,354	$ 33,930
Accounts receivable, trade, less allowance of $8,246 and $8,613, respectively	323,375	337,927
Other receivables	44,247	26,545
Inventories and supplies	9,750	10,060
Prepaid taxes, licenses and permits	7,462	16,619
Other current assets	37,137	31,577
Total current assets	436,325	456,658
Property and equipment	2,384,254	2,247,577
Less – accumulated depreciation	808,906	760,015
Property and equipment, net	1,575,348	1,487,562
Other non-current assets	151,866	139,284
Total assets	2,163,539	2,083,504
Current liabilities:
Checks issued in excess of cash balances	8,902	0
Accounts payable	89,348	97,781
Current portion of long-term debt	75,000	75,000
Insurance and claims accruals	91,305	67,304
Accrued payroll	38,501	40,271
Other current liabilities	28,865	30,004
Total current liabilities	331,921	310,360
Long-term debt, net of current portion	275,000	50,000
Other long-term liabilities	20,511	10,911
Insurance and claims accruals, net of current portion	229,870	214,030
Deferred income taxes	241,433	233,450
Commitments and contingencies
Stockholders’ equity:
Common stock, $0.01 par value, 200,000,000 shares authorized; 80,533,536 shares issued; 69,204,715 and 70,441,973 shares outstanding, respectively	805	805
Paid-in capital	112,064	107,455
Retained earnings	1,252,344	1,413,746
Accumulated other comprehensive loss	(17,645)	(16,073)
Treasury stock, at cost; 11,328,821 and 10,091,563 shares, respectively	(282,764)	(241,180)
Total stockholders’ equity	1,064,804	1,264,753
Total liabilities and stockholders’ equity	$ 2,163,539	$ 2,083,504