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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities:      
Net income $ 15,560 $ 11,429 $ 1,011
Adjustments required to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 9,205 10,037 12,203
Share-based compensation expense 1,203 1,071 1,625
Other than temporary impairment and loss from sale of marketable securities 330
Accrued severance pay and pensions, net 3 28 (1,188)
Decrease (increase) in trade receivables, net (6,403) 11,051 39,545
Decrease (increase) in other accounts receivable and prepaid expenses (including other long term assets) (259) 4,747 (1,291)
Decrease (increase) in inventories (8,592) 4,706 10,240
Increase (decrease) in trade payables 4,836 (2,355) (28,444)
Increase (decrease) in deferred revenues 2,575 (6,228) (8,766)
Decrease in deferred tax asset, net 497 478 1,975
Decrease in other accounts payable and accrued expenses (including other long term liabilities) (1,474) (9,193) (11,119)
Net cash provided by operating activities 17,151 25,771 16,121
Cash flows from investing activities:      
Purchase of property and equipment, net (8,533) (8,190) (5,266)
Purchase and capitalization of intangible assets, net (1,407)
Investment in bank deposits (996) (153) (19)
Proceeds from maturities of short-term bank deposits 153 432
Proceeds from sale of marketable securities 122
Net cash used in investing activities (10,936) (8,190) (4,731)
Cash flows from financing activities:      
Proceeds and loans from financial institutions 4,200
Repayment of bank loan (17,000) (17,922) (20,182)
Proceeds from exercise of options 294 75 138
Net cash used in financing activities (16,706) (17,847) (15,844)
Effect of exchange rate changes on cash 30 286 (651)
Increase (decrease) in cash and cash equivalents (10,461) 20 (5,105)
Cash and cash equivalents at the beginning of the year 36,338 36,318 41,423
Cash and cash equivalents at the end of the year 25,877 36,338 36,318
Supplemental disclosure of cash flow information:      
Cash paid during the year for income taxes 2,493 1,370 1,509
Cash paid during the year for interest $ 1,837 $ 1,739 $ 2,820