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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash flows from operating activities:      
Net income (loss) $ 11,429 $ 1,011 $ (76,479)
Adjustments required to reconcile net income (loss) to net cash provided by (used in) operating activities:      
Depreciation and amortization 10,037 12,203 13,498
Share-based compensation expense 1,071 1,625 3,345
Impairment of long-lived assets 2,367
Impairment of goodwill 14,765
Other than temporary impairment and loss from sale of marketable securities 330 3,471
Accrued severance pay and pensions, net 28 (1,188) (787)
Decrease (increase) in trade receivables, net 11,051 39,545 (33,876)
Decrease in other accounts receivable and prepaid expenses 4,747 (1,291) 11,283
Decrease in inventories 4,706 10,240 1,792
Increase (decrease) in trade payables (2,355) (28,444) 25,155
Increase (decrease) in deferred revenues (6,228) (8,766) 9,699
Decrease in deferred tax asset, net 478 1,975 9,788
Decrease in other accounts payable and accrued expenses (including other long term liabilities) (9,193) (11,119) (16,300)
Net cash provided by (used in) operating activities 25,771 16,121 (32,279)
Cash flows from investing activities:      
Purchase of property and equipment (8,190) (5,266) (12,691)
Investment in short-term bank deposits (153) (19) (36)
Proceeds from maturities of short-term bank deposits 153 432 69
Proceeds from sale of marketable securities 122 5,161
Net cash used in investing activities (8,190) (4,731) (7,497)
Cash flows from financing activities:      
Proceeds and loans from financial institutions 4,200 22,691
Repayment of bank loan (17,922) (20,182) (29,012)
Proceeds from issuance of shares, net 45,149
Proceeds from exercise of options 75 138
Net cash provided by (used in) financing activities (17,847) (15,844) 38,828
Effect of exchange rate changes on cash 286 (651) (36)
Decrease in cash and cash equivalents 20 (5,105) (984)
Cash and cash equivalents at the beginning of the year 36,318 41,423 42,407
Cash and cash equivalents at the end of the year 36,338 36,318 41,423
Supplemental disclosure of cash flow information:      
Cash paid during the year for income taxes 1,370 1,509 2,572
Cash paid during the year for interest $ 1,739 $ 2,820 $ 3,541