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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Oct. 31, 2014
Oct. 31, 2013
Cash flows from operating activities:    
Net (loss) income $ (7) $ 2,986
Adjustments to reconcile net (loss) income to net cash provided by operating activities:    
Depreciation and amortization 27,866 23,242
Stock-based compensation 1,006 839
Provision for doubtful accounts, net of charge offs   1,048
Provision for inventory obsolescence 44 70
Gross profit from sale of lease pool equipment (1,845) (4,108)
Excess tax benefit from exercise of non-qualified stock options and restricted shares   (44)
Deferred tax benefit (1,742) (2,495)
Changes in working capital items:    
Accounts receivable (1,076) (4,569)
Contracts and notes receivable (2,632) 1,277
Inventories 630 (2,827)
Prepaid expenses and other current assets (7,449) (1,449)
Income taxes payable (331) 3,382
Accounts payable, accrued expenses, other current liabilities and deferred revenue 2,079 1,338
Net cash provided by operating activities 16,543 18,690
Cash flows from investing activities:    
Purchases of seismic equipment held for lease (15,079) (13,308)
Acquisition of business (14,500)  
Purchases of property and equipment (375) (452)
Sale of used lease pool equipment 2,861 6,188
Net cash used in investing activities (27,093) (7,572)
Cash flows from financing activities:    
Net proceeds from (payments on) revolving line of credit 2,500 (1,000)
Net proceeds from term loan 10,000  
Payments on borrowings (74) (105)
Net proceeds from short-term investments 85 30
Proceeds from issuance of common stock upon exercise of options 99 275
Purchase of treasury stock (9,776) (2,200)
Excess tax benefit from exercise of non-qualified stock options and restricted shares   44
Net cash provided by (used in) financing activities 2,834 (2,956)
Effect of changes in foreign exchange rates on cash and cash equivalents 1,623 897
Net change in cash and cash equivalents (6,093) 9,059
Cash and cash equivalents, beginning of period 15,162 15,150
Cash and cash equivalents, end of period 9,069 24,209
Supplemental cash flow information:    
Interest paid 576 206
Income taxes paid 836 (74)
Purchases of seismic equipment held for lease in accounts payable at end of period $ 3,438 $ 5,208