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Condensed Statements Of Operations - USD ($)
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Income Statement [Abstract]    
Revenue from operations $ 754,096,000 $ 707,733,000
Operating expenses:    
Salaries, wages and benefits 416,504,000 400,869,000
Operating supplies and expenses 90,987,000 75,372,000
General supplies and expenses 22,872,000 21,142,000
Operating taxes and licenses 24,022,000 23,188,000
Insurance and claims 8,790,000 10,244,000
Communications and utilities 7,433,000 7,005,000
Depreciation and amortization 50,287,000 44,772,000
Purchased transportation 17,997,000 18,496,000
Building and office equipment rents 2,114,000 2,273,000
Miscellaneous expenses, net 4,968,000 4,824,000
Total operating expenses 645,974,000 608,185,000
Operating income 108,122,000 99,548,000
Non-operating expense (income):    
Interest expense 595,000 1,183,000
Interest income (35,000) (16,000)
Other expense (income), net 409,000 516,000
Total non-operating expense 969,000 1,683,000
Income before income taxes 107,153,000 97,865,000
Provision for income taxes 41,361,000 37,580,000
Net income $ 65,792,000 $ 60,285,000
Earnings per share:    
Basic $ 0.80 $ 0.72
Diluted 0.80 0.72
Dividends declared per share $ 0.10 $ 0.00
Weighted average shares outstanding:    
Basic 82,349,024 83,983,028
Diluted 82,444,458 83,983,028