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Shareholders' Equity (Compensation Expenses Before Tax) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Compensation expense | $ 3,326 | $ 1,996 | $ 5,211
Cost Of Revenues [Member] |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Compensation expense | 1,785 | 924 | 2,353
R&D And Marketing Expenses [Member] |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Compensation expense | 425 | 458 | 954
General And Administrative Expenses [Member] |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Compensation expense | $ 1,116 | $ 614 | $ 1,904

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