Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 52,363	$ 7,600
Trade accounts receivable, net	1,002,483	1,051,698
Prepaid expenses and other, net	383,313	443,683
Total current assets	1,438,159	1,502,981
Property and equipment, at cost	5,453,569	5,329,243
Less accumulated depreciation	1,913,831	1,884,132
Net property and equipment	3,539,738	3,445,111
Goodwill and intangible assets, net	196,940	105,157
Other assets	152,445	38,398
Total assets	5,327,282	5,091,647
Current liabilities:
Current portion of long-term debt		250,706
Trade accounts payable	594,704	709,736
Claims accruals	267,481	275,139
Accrued payroll	63,991	80,922
Other accrued expenses	72,063	35,845
Total current liabilities	998,239	1,352,348
Long-term debt	1,284,550	898,398
Other long-term liabilities	172,239	96,056
Deferred income taxes	668,490	643,461
Stockholders' equity	2,203,764	2,101,384
Total liabilities and stockholders' equity	$ 5,327,282	$ 5,091,647