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Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Current assets:    
Cash and cash equivalents $ 529,595 $ 313,302
Trade accounts receivable, net 1,442,948 1,124,403
Prepaid expenses and other 292,604 404,412
Total current assets 2,265,147 1,842,117
Property and equipment, at cost 6,350,141 5,908,710
Less accumulated depreciation 2,495,557 2,219,816
Net property and equipment 3,854,584 3,688,894
Goodwill and intangible assets, net 201,706 212,122
Other assets, net 191,753 185,215
Total assets 6,513,190 5,928,348
Current liabilities:    
Current portion of long-term debt 354,755 0
Trade accounts payable 749,071 587,510
Claims accruals 288,137 276,056
Accrued payroll 163,940 130,943
Other accrued expenses 88,724 90,294
Total current liabilities 1,644,627 1,084,803
Long-term debt 944,887 1,305,424
Other long-term liabilities 270,860 245,961
Deferred income taxes 730,588 692,022
Stockholders' equity 2,922,228 2,600,138
Total liabilities and stockholders' equity $ 6,513,190 $ 5,928,348