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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
OPERATING ACTIVITIES:      
Net income $ 23,994,000 $ 38,899,000 $ 11,101,000
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation 49,387,000 42,274,000 39,114,000
Bad debt expense 889,000 341,000 445,000
Stock compensation—net of excess tax benefits 732,000 614,000 302,000
Sale leaseback deferred gain amortization (131,000)
Provision for (benefit from) deferred income taxes 7,206,000 (24,630,000) 6,658,000
Reclassification of other than temporary impairment in marketable equity securities 42,000 709,000
Recognized loss (gain) on marketable equity securities 5,388,000 (4,735,000) (1,003,000)
Gain on sale or disposal of equipment (1,306,000) (58,000) (4,700,000)
Changes in operating assets and liabilities:      
Accounts receivable (5,970,000) (1,298,000) (6,408,000)
Prepaid expenses, deposits, inventories, and other assets (137,000) (1,095,000) (685,000)
Income taxes refundable (76,000) (155,000) 2,127,000
Trade accounts payable 1,731,000 682,000 3,231,000
Accrued expenses and other liabilities 509,000 (266,000) (3,041,000)
Net cash provided by operating activities 82,347,000 50,614,000 47,719,000
INVESTING ACTIVITIES:      
Purchases of property and equipment (73,882,000) (67,674,000) (86,128,000)
Proceeds from disposition of equipment 24,904,000 18,766,000 32,256,000
Sales of marketable equity securities 1,045,000 6,833,000 1,550,000
Purchases of marketable equity securities, net of return of capital (7,318,000) (3,211,000) (810,000)
Net cash used in investing activities (55,251,000) (45,286,000) (53,132,000)
FINANCING ACTIVITIES:      
Borrowings under line of credit 615,612,000 483,297,000 520,089,000
Repayments under line of credit (605,419,000) (485,163,000) (528,200,000)
Borrowings of long-term debt 52,717,000 55,415,000 83,517,000
Repayments of long-term debt (82,442,000) (48,110,000) (47,457,000)
Borrowings under margin account 7,584,000 3,412,000 1,078,000
Repayments under margin account (2,206,000) (7,867,000) (2,669,000)
Repurchases of common stock (13,369,000) (6,348,000) (21,056,000)
Proceeds from exercise of stock options 485,000 123,000 91,000
Net cash (used in) provided by financing activities (27,038,000) (5,241,000) 5,393,000
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 58,000 87,000 (20,000)
CASH, CASH EQUIVALENTS—Beginning of year 224,000 137,000 157,000
CASH, CASH EQUIVALENTS—End of year 282,000 224,000 137,000
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION—      
Interest 6,095,000 3,905,000 3,597,000
Income taxes 217,000 518,000 286,000
NONCASH INVESTING AND FINANCING ACTIVITIES—      
Purchases of revenue equipment included in accounts payable $ 1,597,000 $ 2,973,000 $ 97,000