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Consolidated Statements Of Comprehensive Income (Loss) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Consolidated Statements Of Comprehensive Income (Loss) [Abstract]      
Net income (loss) $ (23,391) $ (53,654) $ 14,062
Other comprehensive income:      
Unrealized gain from available-for-sale marketable securities (44) 234 159
Change in unrealized loss from hedging activities (net of tax effect of $257) 700 (492) (100)
Foreign currency translation differences (803) (244)  
Total of comprehensive income (loss) $ (23,538) $ (54,156) $ 14,121