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Condensed Consolidated Statements of Cash Flows (unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
OPERATING ACTIVITIES:    
Net (loss) income $ (456) $ 674
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation 10,094 9,247
Bad debt expense 301 153
Stock compensation-net of excess tax benefits 228 99
(Benefit from) provision for deferred income taxes (328) 411
Reclassification of unrealized loss on marketable equity securities 24 0
Recognized gain on sale of marketable equity securities (20) (315)
(Gain) loss on sale or disposal of equipment (142) 36
Changes in operating assets and liabilities:    
Accounts receivable (8,424) (11,241)
Prepaid expenses, inventories, and other assets 2,130 695
Income taxes refundable 23 29
Trade accounts payable 3,966 2,013
Accrued expenses and other liabilities 2,592 1,726
Net cash provided by operating activities 9,988 3,527
INVESTING ACTIVITIES:    
Purchases of property and equipment (23,676) (22,336)
Proceeds from disposition of equipment 7,320 4,657
Change in restricted cash (1,969) 1,716
Sales of marketable equity securities 13 526
Purchases of marketable equity securities, net of return of capital (3) 46
Net cash used in investing activities (18,315) (15,391)
FINANCING ACTIVITIES:    
Borrowings under line of credit 31,204 104,347
Repayments under line of credit (25,986) (101,729)
Borrowings of long-term debt 16,776 18,795
Repayments of long-term debt (12,804) (9,691)
Borrowings under margin account 49 734
Repayments under margin account (205) (562)
Repurchases of common stock (341) 0
Exercise of stock options 0 55
Net cash provided by financing activities 8,693 11,949
NET INCREASE IN CASH AND CASH EQUIVALENTS 366 85
CASH AND CASH EQUIVALENTS-Beginning of period 507 180
CASH AND CASH EQUIVALENTS-End of period 873 265
Cash paid during the period for:    
Interest 831 567
Income taxes 7 5
NONCASH INVESTING AND FINANCING ACTIVITIES-    
Purchases of property and equipment included in accounts payable 2,437 2,226
Common stock dividends declared included in accrued expenses and other liabilities $ 0 $ 8,702