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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
OPERATING ACTIVITIES:      
Net income $ 38,899,000 $ 11,101,000 $ 21,436,000
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation 42,274,000 39,114,000 32,346,000
Bad debt expense 341,000 445,000 151,000
Stock compensation—net of excess tax benefits 614,000 302,000 267,000
Sale leaseback deferred gain amortization 0 (131,000) (224,000)
(Benefit) provision for deferred income taxes (24,630,000) 6,658,000 12,901,000
Reclassification of other than temporary impairment in marketable equity securities 42,000 709,000 833,000
Recognized gain on marketable equity securities (4,735,000) (1,003,000) (1,001,000)
Gain on sale or disposal of equipment (58,000) (4,700,000) (5,754,000)
Changes in operating assets and liabilities:      
Accounts receivable (1,436,000) (6,725,000) 1,128,000
Prepaid expenses, deposits, inventories, and other assets (1,095,000) (685,000) 1,470,000
Income taxes refundable (155,000) 2,127,000 (2,358,000)
Trade accounts payable 682,000 3,231,000 886,000
Accrued expenses and other liabilities (266,000) (3,041,000) (556,000)
Net cash provided by operating activities 50,476,000 47,402,000 61,525,000
INVESTING ACTIVITIES:      
Purchases of property and equipment (67,674,000) (86,128,000) (125,720,000)
Proceeds from disposition of equipment 18,766,000 32,256,000 33,472,000
Changes in restricted cash 138,000 317,000 8,012,000
Sales of marketable equity securities 6,833,000 1,550,000 1,500,000
Purchases of marketable equity securities, net of return of capital (3,211,000) (810,000) (2,769,000)
Net cash used in investing activities (45,148,000) (52,815,000) (85,505,000)
FINANCING ACTIVITIES:      
Borrowings under line of credit 483,297,000 520,089,000 549,955,000
Repayments under line of credit (485,163,000) (528,200,000) (539,979,000)
Borrowings of long-term debt 55,415,000 83,517,000 88,018,000
Repayments of long-term debt (48,110,000) (47,457,000) (53,947,000)
Borrowings under margin account 3,412,000 1,078,000 3,005,000
Repayments under margin account (7,867,000) (2,669,000) (2,779,000)
Repurchases of common stock (6,348,000) (21,056,000) (48,021,000)
Exercise of stock options 123,000 91,000 236,000
Net cash (used in) provided by financing activities (5,241,000) 5,393,000 (3,512,000)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 87,000 (20,000) (27,492,000)
CASH, CASH EQUIVALENTS—Beginning of year 137,000 157,000 27,649,000
CASH, CASH EQUIVALENTS—End of year 224,000 137,000 157,000
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION—      
Interest 3,905,000 3,597,000 2,821,000
Income taxes 518,000 286,000 2,950,000
NONCASH INVESTING AND FINANCING ACTIVITIES—      
Purchases of revenue equipment included in accounts payable $ 2,973,000 $ 97,000 $ 5,031,000