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Consolidated Statements of Earnings - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating revenues $ 9,636,573 $ 9,165,258 $ 8,614,874
Operating expenses:      
Rents and purchased transportation 4,954,123 4,528,812 4,434,540
Salaries, wages and employee benefits 2,347,716 2,167,851 1,926,213
Depreciation and amortization 527,375 499,145 435,893
Fuel and fuel taxes 357,483 463,195 459,011
Operating supplies and expenses 334,350 333,113 303,529
General and administrative expenses, net of asset dispositions 180,083 191,933 163,270
Insurance and claims 134,482 157,251 129,406
Operating taxes and licenses 54,331 55,336 51,080
Communication and utilities 33,511 34,797 30,911
Total operating expenses 8,923,454 8,431,433 7,933,853
Operating income 713,119 733,825 681,021
Interest income 486 1,754 224
Interest expense 47,580 54,684 40,427
Earnings before income taxes 666,025 680,895 640,818
Income taxes 159,990 164,575 151,233
Net earnings $ 506,035 $ 516,320 $ 489,585
Weighted average basic shares outstanding (in shares) 105,700 107,329 109,375
Basic earnings per share (in dollars per share) $ 4.79 $ 4.81 $ 4.48
Weighted average diluted shares outstanding (in shares) 106,766 108,307 110,428
Diluted earnings per share (in dollars per share) $ 4.74 $ 4.77 $ 4.43
Dividends declared per common share (in dollars per share) $ 1.08 $ 1.04 $ 0.96
Service Excluding Fuel Surcharge [Member]      
Operating revenues $ 8,879,653 $ 8,122,600 $ 7,557,648
Fuel Surcharge [Member]      
Operating revenues $ 756,920 $ 1,042,658 $ 1,057,226