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Condensed Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 3,508 $ 2,497
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 3,787 3,292
Deferred taxes 2,150 1,502
Stock options and restricted stock expense 323 183
Gain on disposal of assets 0 (675)
Changes in current assets and liabilities:    
Trade accounts receivables, net 2,575 (1,924)
Inventory, net 379 1,662
Prepaid income taxes and prepaid expenses (174) 1,302
Accounts payable and accrued liabilities (1,334) 306
Current income tax liability 0 29
Deferred income 3,627 825
NET CASH PROVIDED BY OPERATING ACTIVITIES 14,841 8,999
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property and equipment (1,787) (10,129)
Proceeds from sale of property and equipment 0 952
NET CASH USED IN INVESTING ACTIVITIES (1,787) (9,177)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from other long-term liabilities, net (6) 0
Proceeds from exercise of stock options 0 198
NET CASH PROVIDED BY FINANCING ACTIVITIES (6) 198
NET CHANGE IN CASH 13,048 20
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 16,390 16,390
CASH AND CASH EQUIVALENTS AT END OF PERIOD 29,438 19,157
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:    
Interest paid 0 10
Income taxes paid 0 0
NON-CASH TRANSACTIONS    
Transfer of rental equipment to inventory $ 4,010 $ 0