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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
OPERATING ACTIVITIES:      
Net income (loss) $ 2,179 $ (2,857) $ (655)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Depreciation 38,298 34,163 27,035
Bad debt (recovery) expense (285) 22 274
Stock compensation-net of excess tax benefits 346 149 118
Provision for (benefit from) deferred income taxes 1,365 (2,768) (1,143)
Reclassification of unrealized loss on marketable equity securities 70 315 60
Recognized gain on sale of marketable equity securities (2,362) (817) (329)
(Gain) loss on sale or disposal of equipment (166) 98 (337)
Changes in operating assets and liabilities:      
Accounts receivable (2,837) 1,580 (2,232)
Prepaid expenses, deposits, inventories, and other assets (426) (2,290) (5,005)
Income taxes (payable) refundable (115) 2,139 (1,883)
Trade accounts payable (3,369) 4,987 108
Accrued expenses and other liabilities 927 174 (1,007)
Net cash provided by operating activities 33,625 34,895 15,004
INVESTING ACTIVITIES:      
Purchases of property and equipment (98,046) (69,352) (24,056)
Proceeds from disposition of equipment 21,190 9,023 11,614
Changes in restricted cash (215) (40) (746)
Sales of marketable equity securities 4,554 1,137 622
Purchases of marketable equity securities, net of return of capital (77) (2,142) (1,621)
Net cash used in investing activities (72,594) (61,374) (14,187)
FINANCING ACTIVITIES:      
Borrowings under line of credit 445,224 349,868 378,347
Repayments under line of credit (449,135) (340,540) (378,347)
Borrowings of long-term debt 72,991 36,064 15,048
Repayments of long-term debt (23,152) (24,430) (11,970)
Borrowings under margin account 15,948 1,512 0
Repayments under margin account (5,237) (1,512) 0
Repurchases of common stock 0 (8,112) 0
Stock compensation excess tax benefits 6 16 5
Dividends paid (17,403) 0 0
Exercise of stock options 54 19 4
Net cash provided by financing activities 39,296 12,885 3,087
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 327 (13,594) 3,904
CASH AND CASH EQUIVALENTS-Beginning of year 180 13,774 9,870
CASH AND CASH EQUIVALENTS-End of year 507 180 13,774
Cash paid during the period for:      
Interest 2,558 1,778 2,243
Income taxes 174 90 2,296
NONCASH INVESTING AND FINANCING ACTIVITIES-      
Purchases of revenue equipment included in accounts payable $ 2,794 $ 4,211 $ 2,525