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Condensed Consolidated Statements of Cash Flows (unaudited) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
OPERATING ACTIVITIES:    
Net income (loss) $ 1,609 $ (1,286)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation 18,554 16,674
Bad debt expense 2 84
Stock compensation-net of excess tax benefits 254 135
Provision for (benefit from) deferred income taxes 986 (757)
Reclassification of unrealized loss on marketable equity securities 44 193
Recognized gain on sale of marketable equity securities (1,043) (759)
(Gain) loss on sale or disposal of equipment (243) 27
Changes in operating assets and liabilities:    
Accounts receivable (5,617) (7,550)
Prepaid expenses, deposits, inventories, and other assets 2,617 2,358
Income taxes (payable) refundable (71) 2,050
Trade accounts payable 3,346 4,631
Accrued expenses and other liabilities 1,923 2,065
Net cash provided by operating activities 22,361 17,865
INVESTING ACTIVITIES:    
Purchases of property and equipment (42,986) (16,138)
Proceeds from disposition of equipment 10,936 1,517
Change in restricted cash 771 (647)
Sales of marketable equity securities 2,152 966
Purchases of marketable equity securities, net of return of capital 45 (524)
Net cash used in investing activities (29,082) (14,826)
FINANCING ACTIVITIES:    
Borrowings under line of credit 209,827 188,135
Repayments under line of credit (219,156) (188,135)
Borrowings of long-term debt 35,498 70
Repayments of long-term debt (13,479) (6,808)
Borrowings under margin account 8,773 0
Repayments under margin account (2,392) 0
Repurchases of common stock 0 (5,301)
Dividends paid (8,702) 0
Exercise of stock options 55 15
Net cash provided by (used in) financing activities 10,424 (12,024)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 3,703 (8,985)
CASH AND CASH EQUIVALENTS-Beginning of period 180 13,774
CASH AND CASH EQUIVALENTS-End of period 3,883 4,789
Cash paid during the period for:    
Interest 1,190 996
Income taxes 158 53
NONCASH INVESTING AND FINANCING ACTIVITIES-    
Purchases of property and equipment included in accounts payable $ 4,231 $ 3,197