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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash flows from operating activities:      
Net earnings $ 432,090 $ 427,235 $ 374,792
Adjustments to reconcile net earnings to net cash provided by operating activities:      
Depreciation and amortization 361,510 339,613 294,496
Share-based compensation 40,625 37,228 35,333
(Gain)/loss on sale of revenue equipment and other 5,490 (1,281) (6,342)
Provision for deferred income taxes 50,414 80,427 79,343
Changes in operating assets and liabilities:      
Trade accounts receivable (120,994) 8,011 (72,339)
Income taxes receivable or payable 60,956 3,055 (72,291)
Other current assets (37,101) (26,493) (42,730)
Trade accounts payable 60,818 8,600 15,284
Claims accruals 5,524 7,502 28,498
Accrued payroll and other accrued expenses (5,189) (10,589) 12,735
Net cash provided by operating activities 854,143 873,308 646,779
Cash flows from investing activities:      
Additions to property and equipment (638,430) (725,122) (808,569)
Proceeds from sale of equipment 153,174 168,686 148,859
Change in other assets (132) (20,096) 29
Net cash used in investing activities (485,388) (576,532) (659,681)
Cash flows from financing activities:      
Proceeds from issuances of long-term debt 349,129 499,642
Payments on long-term debt (250,000) (250,000)
Proceeds from revolving lines of credit and other 1,715,427 2,110,800 2,092,193
Payments on revolving lines of credit and other (1,724,365) (2,138,466) (2,110,749)
Purchase of treasury stock (249,760) (262,275) (125,000)
Stock option exercises and other 1,341 2,978 7,324
Stock repurchased for payroll taxes (18,641) (24,850) (23,419)
Tax benefit of stock options exercised and restricted shares issued 7,044 12,877 16,645
Dividends paid (98,990) (97,364) (93,604)
Net cash provided by/(used in) financing activities (367,944) (297,171) 13,032
Net increase/(decrease) in cash and cash equivalents 811 (395) 130
Cash and cash equivalents at beginning of year 5,566 5,961 5,831
Cash and cash equivalents at end of year 6,377 5,566 5,961
Supplemental disclosure of cash flow information:      
Interest 24,800 27,245 26,685
Income taxes $ 143,634 $ 163,304 $ 192,955