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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
OPERATING REVENUES:    
Operating revenues $ 221,724 $ 219,448
OPERATING EXPENSES AND COSTS:    
Salaries, wages and benefits 48,278 39,275
Operating supplies and expenses 41,073 31,647
Rent and purchased transportation 87,096 91,376
Depreciation 16,497 14,877
Insurance and claims 15,435 6,863
Other 5,423 4,213
Gain on sale or disposition of equipment (577) (147)
Total operating expenses and costs 213,225 188,104
OPERATING INCOME 8,499 31,344
NON-OPERATING INCOME 899 1,929
INTEREST EXPENSE (2,356) (1,667)
INCOME BEFORE INCOME TAXES 7,042 31,606
FEDERAL AND STATE INCOME TAX EXPENSE (BENEFIT):    
Current 2,371 3,538
Deferred (560) 4,126
Total federal and state income tax expense 1,811 7,664
Net income $ 5,231 $ 23,942
INCOME PER COMMON SHARE:    
Basic (in dollars per share) $ 0.24 $ 1.07
Diluted (in dollars per share) $ 0.23 $ 1.06
AVERAGE COMMON SHARES OUTSTANDING:    
Basic (in shares) 22,148 22,292
Diluted (in shares) 22,317 22,483
Freight Transportation Service [Member]    
OPERATING REVENUES:    
Operating revenues $ 193,454 $ 196,089
Fuel Surcharge [Member]    
OPERATING REVENUES:    
Operating revenues $ 28,270 $ 23,359