Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 48,454	$ 35,000
Trade accounts receivable, net	978,280	1,011,829
Prepaid expenses and other	371,235	434,470
Total current assets	1,397,969	1,481,299
Property and equipment, at cost	5,682,573	5,640,806
Less accumulated depreciation	2,064,273	2,019,940
Net property and equipment	3,618,300	3,620,866
Goodwill and intangible assets, net	199,437	202,832
Other assets	164,336	165,857
Total assets	5,380,042	5,470,854
Current liabilities:
Trade accounts payable	497,649	602,601
Claims accruals	265,540	279,590
Accrued payroll	75,736	68,220
Other accrued expenses	70,451	85,355
Total current liabilities	909,376	1,035,766
Long-term debt	1,302,756	1,295,740
Other long-term liabilities	170,944	173,241
Deferred income taxes	714,548	699,078
Stockholders' equity	2,282,418	2,267,029
Total liabilities and stockholders' equity	$ 5,380,042	$ 5,470,854