Consolidated Condensed Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 45,921	$ 22,604
Accounts receivable, trade, less allowance of $9,710 and $10,017, respectively	250,878	266,727
Other receivables	20,463	20,316
Inventories and supplies	16,355	17,824
Prepaid taxes, licenses and permits	6,974	14,914
Current deferred income taxes	29,541	34,066
Income taxes receivable	1,765	23,435
Other current assets	28,936	26,458
Total current assets	400,833	426,344
Property and equipment	1,885,532	1,786,229
Less – accumulated depreciation	761,200	772,447
Property and equipment, net	1,124,332	1,013,782
Other non-current assets	46,807	40,336
Total assets	1,571,972	1,480,462
Current liabilities:
Accounts payable	83,436	64,827
Insurance and claims accruals	61,298	73,814
Accrued payroll	37,057	28,121
Other current liabilities	28,095	19,768
Total current liabilities	209,886	186,530
Long-term debt, net of current portion	75,000	75,000
Other long-term liabilities	21,073	20,021
Insurance and claims accruals, net of current portion	129,895	123,445
Deferred income taxes	$ 232,878	$ 241,606
Commitments and contingencies
Stockholders’ equity:
Common stock, $0.01 par value, 200,000,000 shares authorized; 80,533,536 shares issued; 71,892,934 and 72,038,368 shares outstanding, respectively	$ 805	$ 805
Paid-in capital	104,619	101,803
Retained earnings	990,638	915,085
Accumulated other comprehensive loss	(13,321)	(9,375)
Treasury stock, at cost; 8,640,602 and 8,495,168 shares, respectively	(179,501)	(174,458)
Total stockholders’ equity	903,240	833,860
Total liabilities and stockholders’ equity	$ 1,571,972	$ 1,480,462