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Condensed Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Income Statement [Abstract]    
Revenue from operations $ 1,442,136 $ 1,497,280
Operating expenses:    
Salaries, wages and benefits 652,075 680,189
Operating supplies and expenses 192,384 191,357
General supplies and expenses 39,545 35,513
Operating taxes and licenses 36,701 35,076
Insurance and claims 16,028 16,107
Communications and utilities 11,017 9,876
Depreciation and amortization 75,947 67,340
Purchased transportation 30,615 52,500
Miscellaneous expenses, net 4,775 3,704
Total operating expenses 1,059,087 1,091,662
Operating income 383,049 405,618
Non-operating (income) expense:    
Interest expense 200 73
Interest income (2,811) (129)
Other expense, net 1,511 605
Total non-operating (income) expense (1,100) 549
Income before income taxes 384,149 405,069
Provision for income taxes 99,111 105,318
Net income $ 285,038 $ 299,751
Earnings per share:    
Basic $ 2.59 $ 2.62
Diluted $ 2.58 $ 2.60
Weighted average shares outstanding:    
Basic 109,956 114,419
Diluted 110,679 115,173
Dividends declared per share $ 0.40 $ 0.30