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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash flows from operating activities:    
Net income (loss) $ 2,947 $ (43)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization of fixed and intangible assets 4,315 3,954
Amortization of other long term assets 1,092 1,430
Amortization of discounted liabilities 9 49
Stock-based compensation 456 1,427
Tax benefit from exercise of stock options (35) (1)
Operating loss from equity method investment 82  
Changes in assets and liabilities associated with operations:    
(Increase) decrease in net receivables (10,202) 3,611
Increase in inventories (7,938) (1,350)
Increase in prepaid expenses and other assets (1,036) (1,301)
Decrease (increase) in income tax receivable/payable, net 1,205 (378)
Increase in accounts payable 13,031 3,570
(Decrease) increase in deferred revenue (1,848) 3,660
Increase in other payables and accrued expenses 7,512 5,214
Net cash provided by operating activities 9,590 19,842
Cash flows from investing activities:    
Capital expenditures (715) (1,522)
Investment (3,283)  
Net cash used in investing activities (3,998) (1,522)
Cash flows from financing activities:    
Net payments under line of credit agreement (2,600) (14,400)
Payments on other long-term liabilities (373) (351)
Tax benefit from exercise of stock options 35 1
Increase in other notes payable   200
Net payments from the issuance of common stock (sale of stock under ESPP and exercise of stock options) (315) (965)
Payment of cash dividends   (569)
Net cash used in by financing activities (3,253) (16,084)
Net increase in cash and cash equivalents 2,339 2,236
Cash and cash equivalents at beginning of period 5,524 4,885
Effect of exchange rate changes on cash 53 (251)
Cash and cash equivalents at end of period $ 7,916 $ 6,870