Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 318,549	$ 35,000
Trade accounts receivable, net	1,121,825	1,011,829
Prepaid expenses and other	288,224	434,470
Total current assets	1,728,598	1,481,299
Property and equipment, at cost	5,842,114	5,640,806
Less accumulated depreciation	2,159,710	2,019,940
Net property and equipment	3,682,404	3,620,866
Goodwill and intangible assets, net	192,648	202,832
Other assets, net	175,412	165,857
Total assets	5,779,062	5,470,854
Current liabilities:
Trade accounts payable	603,523	602,601
Claims accruals	273,088	279,590
Accrued payroll	145,110	68,220
Other accrued expenses	73,702	85,355
Total current liabilities	1,095,423	1,035,766
Long-term debt	1,303,353	1,295,740
Other long-term liabilities	181,561	173,241
Deferred income taxes	711,301	699,078
Stockholders' equity	2,487,424	2,267,029
Total liabilities and stockholders' equity	$ 5,779,062	$ 5,470,854