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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
CASH FLOWS PROVIDED BY OPERATING ACTIVITIES:      
Net income $ 90,284,000 $ 33,464,000 $ 35,745,000
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation 85,120,000 82,445,000 75,323,000
Deferred income taxes (47,228,000) 13,490,000 14,720,000
Tax benefits from share-based payment arrangement exercises 46,000 373,000
Share-based payment arrangement compensation expense 1,250,000 883,000 1,404,000
Distribution from affiliate 400,000
Equity in loss from affiliate 271,000 1,018,000 296,000
Changes in other current operating items:      
Receivables (5,974,000) 8,518,000 7,968,000
Prepaid expenses and other (503,000) (1,173,000) (1,274,000)
Accounts payable 11,000 594,000 (4,853,000)
Insurance and claims accruals 6,737,000 3,205,000 2,237,000
Accrued liabilities (2,990,000) 1,813,000 6,419,000
Net cash provided by operating activities 121,879,000 133,801,000 128,670,000
CASH FLOWS USED FOR INVESTING ACTIVITIES:      
Other (43,000) (42,000) (39,000)
Net cash used for investing activities (95,318,000) (97,290,000) (125,081,000)
CASH FLOWS USED FOR FINANCING ACTIVITIES:      
Borrowings under credit facility and long-term debt 40,831,000 179,687,000 141,908,000
Repayment of borrowings under credit facility and long-term debt (48,717,000) (209,668,000) (128,414,000)
Repurchase and retirement of common stock (7,513,000) (16,175,000)
Dividends on common stock (4,361,000) (3,252,000) (3,342,000)
Issuance of common stock from share-based payment arrangement exercises 1,090,000 4,416,000 3,490,000
Change in checks issued in excess of cash balances (745,000)
Employee taxes paid in exchange for shares withheld (47,000) (127,000)
Cash in lieu of fractional shares from stock split (54,000)
Net cash used for financing activities (11,258,000) (36,457,000) (3,278,000)
NET CHANGE IN CASH AND CASH EQUIVALENTS 15,303,000 54,000 311,000
CASH AND CASH EQUIVALENTS:      
Beginning of year 488,000 434,000 123,000
End of year 15,791,000 488,000 434,000
SUPPLEMENTAL NON-CASH DISCLOSURE:      
Change in property and equipment not yet paid (1,559,000) 4,511,000 2,853,000
Income taxes 14,355,000 31,000 2,121,000
Interest 151,000 214,000 252,000
Revenue Equipment [Member]      
Adjustments to reconcile net income to net cash provided by operating activities:      
Gain on disposition of assets (5,499,000) (10,502,000) (5,584,000)
CASH FLOWS USED FOR INVESTING ACTIVITIES:      
Revenue equipment additions (148,856,000) (154,984,000) (174,165,000)
Proceeds from revenue equipment dispositions 61,227,000 65,082,000 56,011,000
Facility [Member]      
Adjustments to reconcile net income to net cash provided by operating activities:      
Gain on disposition of assets (4,104,000)
Buildings And Land Office Equipment And Other [Member]      
CASH FLOWS USED FOR INVESTING ACTIVITIES:      
Revenue equipment additions (7,693,000) (7,369,000) (13,482,000)
Proceeds from revenue equipment dispositions $ 47,000 $ 23,000 $ 6,594,000