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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
OPERATING REVENUES:      
Revenue, before fuel surcharge $ 373,523 $ 382,737 $ 355,403
Fuel surcharge 64,315 50,115 61,647
Total operating revenues 437,838 432,852 417,050
OPERATING EXPENSES AND COSTS:      
Salaries, wages and benefits 102,227 112,235 105,943
Operating supplies and expenses 79,505 82,993 89,878
Rents and purchased transportation 174,477 158,298 134,188
Depreciation 42,274 39,114 32,346
Insurance and claims 17,484 16,632 15,315
Other 9,249 8,352 8,904
Gain on disposition of equipment (58) (4,700) (5,754)
Total operating expenses and costs 425,158 412,924 380,820
OPERATING INCOME 12,680 19,928 36,230
NON-OPERATING INCOME 5,853 1,485 1,516
INTEREST EXPENSE (3,902) (3,641) (2,818)
INCOME BEFORE INCOME TAXES 14,631 17,772 34,928
FEDERAL & STATE INCOME TAX EXPENSE (BENEFIT):      
Current 362 13 591
Deferred (24,630) 6,658 12,901
Total federal & state income tax (benefit) expense (24,268) 6,671 13,492
NET INCOME $ 38,899 $ 11,101 $ 21,436
EARNINGS PER COMMON SHARE:      
Basic (in dollars per share) $ 6.14 $ 1.68 $ 2.94
Diluted (in dollars per share) $ 6.08 $ 1.67 $ 2.93
AVERAGE COMMON SHARES OUTSTANDING:      
Basic (in shares) 6,331 6,627 7,288
Diluted (in shares) 6,398 6,649 7,325