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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities:      
Net earnings $ 686,263 $ 432,090 $ 427,235
Adjustments to reconcile net earnings to net cash provided by operating activities:      
Depreciation and amortization 383,518 361,510 339,613
Share-based compensation 38,291 40,625 37,228
(Gain)/loss on sale of revenue equipment and other 7,370 5,490 (1,281)
Advance deposit impairment 20,240
Deferred income taxes (248,764) 50,414 80,427
Changes in operating assets and liabilities:      
Trade accounts receivable (166,111) (120,994) 8,011
Income taxes receivable or payable (45,542) 60,956 3,055
Other current assets 69,462 (37,101) (26,493)
Trade accounts payable 85,237 60,818 8,600
Claims accruals 25,021 5,524 7,502
Accrued payroll and other accrued expenses 168 (5,189) (10,589)
Net cash provided by operating activities 855,153 854,143 873,308
Cash flows from investing activities:      
Additions to property and equipment (526,928) (638,430) (725,122)
Proceeds from sale of equipment 16,413 153,174 168,686
Business acquisition (136,879)
Change in other assets (3,888) (132) (20,096)
Net cash used in investing activities (651,282) (485,388) (576,532)
Cash flows from financing activities:      
Proceeds from issuances of long-term debt 349,129
Payments on long-term debt (250,000)
Proceeds from revolving lines of credit and other 2,716,155 1,715,427 2,110,800
Payments on revolving lines of credit and other (2,612,501) (1,724,365) (2,138,466)
Purchase of treasury stock (179,813) (249,760) (262,275)
Stock option exercises and other 1,100 1,341 2,978
Stock repurchased for payroll taxes (19,215) (18,641) (24,850)
Tax benefit of stock options exercised and restricted shares issued 7,044 12,877
Dividends paid (101,362) (98,990) (97,364)
Net cash used in financing activities (195,636) (367,944) (297,171)
Net increase/(decrease) in cash and cash equivalents 8,235 811 (395)
Cash and cash equivalents at beginning of year 6,377 5,566 5,961
Cash and cash equivalents at end of year 14,612 6,377 5,566
Supplemental disclosure of cash flow information:      
Interest 28,785 24,800 27,245
Income taxes 190,783 143,634 163,304
Noncash investing activities      
Accruals for equipment received $ 53,026 $ 13,522 $ 32,038