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Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash flows from operating activities:      
Net income (loss) $ (23,391) $ (53,654) $ 14,062
Adjustments required to reconcile net income (loss) to net cash provided by (used in) operating activities:      
Depreciation and amortization 15,030 14,393 4,712
Stock-based compensation expense 5,460 6,564 4,207
Accrued severance pay and pensions, net (488) (1,125) 358
Decrease (increase) in accrued interest and exchange rate on bank deposits 84 (271) (276)
Accrued interest and amortization of premium on marketable securities (323) 647 144
(Increase) in trade receivables, net (9,459) (3,342) (19,622)
Decrease (increase) in other accounts receivable and prepaid expenses (2,294) 6,782 (7,607)
Decrease in inventories, net of write-off 27,210 40,643 4
Increase (decrease) in trade payables 24,986 (3,753) (11,670)
Increase (decrease) in deferred revenues (21,589) (11,925) 2,113
Increase in deferred tax asset, net (743) (1,237) (469)
Increase (decrease) in other accounts payable and accrued expenses (including other long term liabilities) (7,274) (13,847) 3,347
Net cash provided by (used in) operating activities 7,209 (20,125) (10,697)
Cash flows from investing activities:      
Purchase of property and equipment (14,530) (14,447) (9,798)
Payment of business acquired, net of cash (Schedule A)   (42,405) (1,232)
Investment in short and long-term bank deposits (1,266) (7,304) (13,754)
Proceeds from maturities of short and long-term bank deposits 7,920 25,664 31,680
Investment in marketable securities (64)   (18,339)
Proceeds from maturities of marketable securities   4,258 16,591
Proceeds from sale of marketable securities 9,781 6,201  
Net cash provided by (used in) investing activities 1,841 (28,033) 5,148
Cash flows from financing activities:      
Proceeds from Financial institutions, net 27,000 35,000  
Repayment of long-term loans (18,232)    
Proceeds from exercise of options 736 4,474 4,935
Net cash provided by financing activities 9,504 39,474 4,935
Effect of exchange rate changes on cash (446) (50)  
Increase (decrease) in cash and cash equivalents 18,108 (8,734) (614)
Cash and cash equivalents at the beginning of the year 28,991 37,725 38,339
Cash and cash equivalents at the end of the year 47,099 28,991 37,725
Supplemental disclosures of non cash financing and investing activities:      
Purchase of property and equipment 140 617 672
Supplemental disclosure of cash flow information:      
Cash paid during the year for income taxes 2,326 3,849 856
Cash paid during the year for interest 2,113 1,029  
Estimated net fair value of assets acquired and liabilities assumed at the date of acquisition was as follows:      
Working capital, net (excluding cash and cash equivalents)   44,551 132
Property, plant and equipment   9,500 7
Other long-term assets   8,581  
Goodwill and other intangible assets   31,358 1,093
Deferred income taxes, net   3,550  
Long-term liabilities   (55,135)  
Estimated net fair value of assets acquired and liabilities assumed   $ 42,405 $ 1,232