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Shareholders' Equity (Compensation Expenses Before Tax) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Compensation expense | $ 1,996 | $ 5,211 | $ 5,134
Cost Of Revenues [Member] |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Compensation expense | 924 | 2,353 | 2,397
R&D And Marketing Expenses [Member] |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Compensation expense | 458 | 954 | 1,048
General And Administrative Expenses [Member] |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Compensation expense | $ 614 | $ 1,904 | $ 1,689

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