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Condensed Consolidated Statements of Cash Flows (unaudited) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
OPERATING ACTIVITIES:    
Net income (loss) $ 2,490 $ (2,990)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation 28,193 24,745
Bad debt recovery (224) (37)
Stock compensation-net of excess tax benefits 303 147
Provision for (benefit from) deferred income taxes 1,638 (1,951)
Reclassification of unrealized loss on marketable equity securities 63 223
Recognized gain on sale of marketable equity securities (1,985) (726)
(Gain) loss on sale or disposal of equipment (90) 31
Changes in operating assets and liabilities:    
Accounts receivable (6,405) (2,101)
Prepaid expenses, deposits, inventories, and other assets 576 424
Income taxes (payable) refundable (134) 2,065
Trade accounts payable 1,871 12,473
Accrued expenses and other liabilities 1,950 2,553
Net cash provided by operating activities 28,246 34,856
INVESTING ACTIVITIES:    
Purchases of property and equipment (66,003) (35,168)
Proceeds from disposition of equipment 14,114 5,647
Change in restricted cash (41) 510
Sales of marketable equity securities 3,558 966
Purchases of marketable equity securities, net of return of capital (70) (2,039)
Net cash used in investing activities (48,442) (30,084)
FINANCING ACTIVITIES:    
Borrowings under line of credit 324,104 244,761
Repayments under line of credit (327,238) (244,761)
Borrowings of long-term debt 45,422 8,199
Repayments of long-term debt (17,829) (20,205)
Borrowings under margin account 8,908 1,440
Repayments under margin account (4,015) (1,411)
Repurchases of common stock 0 (5,751)
Dividends paid (8,702) 0
Exercise of stock options 55 15
Net cash provided by (used in) financing activities 20,705 (17,713)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 509 (12,941)
CASH AND CASH EQUIVALENTS-Beginning of period 180 13,774
CASH AND CASH EQUIVALENTS-End of period 689 833
Cash paid during the period for:    
Interest 1,812 1,393
Income taxes 169 75
NONCASH INVESTING AND FINANCING ACTIVITIES-    
Purchases of property and equipment included in accounts payable $ 6,707 $ 2,123