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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
OPERATING ACTIVITIES:      
Net income (loss) $ 5,915 $ 2,179 $ (2,857)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Depreciation 39,088 38,298 34,163
Bad debt expense 424 191 22
Stock compensation—net of excess tax benefits 317 346 149
Provision for (benefit from) deferred income taxes 3,597 1,365 (2,768)
Reclassification of other than temporary impairment in marketable equity securities 29 70 315
Recognized gain on sale of marketable equity securities (601) (2,362) (817)
(Gain) loss on sale or disposal of equipment (854) (166) 98
Changes in operating assets and liabilities:      
Accounts receivable (8,873) (3,313) 1,580
Prepaid expenses, deposits, inventories, and other assets 4,918 (426) (2,290)
Income taxes refundable 124 (115) 2,139
Trade accounts payable (2,802) (3,369) 4,987
Accrued expenses and other liabilities 1,888 927 174
Net cash provided by operating activities 43,170 33,625 34,895
INVESTING ACTIVITIES:      
Purchases of property and equipment (71,520) (98,046) (69,352)
Proceeds from disposition of equipment 27,304 21,190 9,023
Changes in restricted cash (120) (215) (40)
Sales of marketable equity securities 857 4,554 1,137
Purchases of marketable equity securities, net of return of capital (838) (77) (2,142)
Net cash used in investing activities (44,317) (72,594) (61,374)
FINANCING ACTIVITIES:      
Borrowings under line of credit 422,324 445,224 349,868
Repayments under line of credit (427,741) (449,135) (340,540)
Borrowings of long-term debt 41,593 72,991 36,064
Repayments of long-term debt (33,208) (23,152) (24,430)
Borrowings under margin account 999 15,948 1,512
Repayments under margin account (1,693) (5,237) (1,512)
Repurchases of common stock (508)   (8,112)
Stock compensation excess tax benefits   6 16
Dividends paid   (17,403)  
Exercise of stock options 46 54 19
Net cash provided by financing activities 1,812 39,296 12,885
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 665 327 (13,594)
CASH AND CASH EQUIVALENTS—Beginning of year 507 180 13,774
CASH AND CASH EQUIVALENTS—End of year 1,172 507 180
Cash paid during the period for:      
Interest 3,417 2,558 1,778
Income taxes 77 174 90
NONCASH INVESTING AND FINANCING ACTIVITIES—      
Purchases of revenue equipment included in accounts payable 598 2,794 4,211
Purchases of common stock included in accrued expenses and other liabilities $ 13,944