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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Cash flows from operating activities:    
Net earnings $ 226,532 $ 253,234
Adjustments to reconcile net earnings to net cash provided by operating activities:    
Depreciation and amortization 260,393 243,924
Noncash lease expense 23,553 18,230
Share-based compensation 34,065 28,304
Loss on sale of revenue equipment and other 2,442 5,042
Deferred income taxes 621 32,601
Changes in operating assets and liabilities:    
Trade accounts receivable 61,193 20,512
Other assets (26,446) (23,403)
Trade accounts payable 10,526 33,015
Income taxes payable or receivable 46,964 34,931
Claims accruals (9,060) 783
Accrued payroll and other accrued expenses 9,167 (40,512)
Net cash provided by operating activities 639,950 606,661
Cash flows from investing activities:    
Additions to property and equipment (342,309) (555,131)
Net proceeds from sale of equipment 77,695 79,800
Business acquisition 0 (98,543)
Changes in other assets 88 (45)
Net cash used in investing activities (264,526) (573,919)
Cash flows from financing activities:    
Proceeds from issuances of long-term debt 0 700,000
Payments on long-term debt 0 (250,000)
Proceeds from revolving lines of credit and other 221,113 1,334,499
Payments on revolving lines of credit and other (220,100) (1,570,400)
Purchase of treasury stock (75,193) (189,734)
Stock repurchased for payroll taxes and other (4,415) (1,554)
Dividends paid (57,175) (56,278)
Net cash used in financing activities (135,770) (33,467)
Net change in cash and cash equivalents 239,654 (725)
Cash and cash equivalents at beginning of period 35,000 7,600
Cash and cash equivalents at end of period 274,654 6,875
Supplemental disclosure of cash flow information:    
Interest 29,771 20,046
Income taxes 31,319 15,794
Noncash investing activities    
Accruals for equipment received $ 22,344 $ 47,920