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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 |

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