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Significant Accounting Policies (Narrative) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
item
Dec. 31, 2010
Significant Accounting Policies [Line Items]      
Short-term bank deposits average interest rate 2.29% 2.29%  
Short-trem bank deposits restriced against bank guarantees $ 422    
Income tax benefit realization threshold 50.00%    
Capitalized computer software costs 3,400    
Period that short-trem bank deposits restriced against bank guarantees   6 months  
Number of reporting units   1  
Increase in revenues due to adoption of accounting standard   23,900  
Warranty expense (income) (1,753) (666) 643
Allowance for doubtful accounts 5,435 3,595  
Doubtful debt expenses 1,727 212 614
Trade receivables sold 15,126 5,866  
Severance expense 1,613 1,747 1,519
Unrealized gains from available-for-sale securities 349 393  
Gain (loss) on hedging derivative instruments 208 (492)  
Foreign currency translation adjustment $ (1,047) $ (244)  
Outstanding options excluded from the calculations of diluted net earnings per share due to their anti-dilutive effect 5,743,458 5,154,612 940,060
Intangible asset impairment more-likely-than-not threshold 50.00%    
Minimum [Member]
      
Significant Accounting Policies [Line Items]      
Intangible assets useful lives   2 years  
Warranty period   12 months  
Maximum [Member]
      
Significant Accounting Policies [Line Items]      
Intangible assets useful lives   7 years  
Warranty period   36 months