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Significant Accounting Policies (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2008
Significant Accounting Policies [Abstract] |  |  |  |
Net gain (impairment net of gains) on sale of marketable securities previously impaired | $ (2,017) | $ 785 | $ 1,277 |
Other than temporary impairment, loss on sale of securities |  |  | 3,134 |
Other than temporary impairment, gain on sale of securities |  |  | 1,857 |
Asset impairment charges | 0 | 0 | 0 |
Goodwill impairment losses | 0 | 0 | 0 | 0
Estimated useful lives of intangible assets, minimum (in years) | 0.5 |  |  |
Estimated useful lives of intangible assets, maximum (in years) | 20 |  |  |
Impairment of assets held for use | 0 | 0 | 0 |
Severance expenses | 4,823 | 4,053 | 4,037 |
Provision for estimated sales returns, stock rotations, and other customer rights | 10,117 | 14,074 |  |
Maximum percentage of annual compensation contributed by employees towards employee benefit plan | 50.00% |  |  |
Maximum amount contributed by employees toward employee benefit plan | 16,500 |  | 3,134 |
Additional amount contributed by employees aged 50 and over towards employee benefit plan | 5,500 |  |  |
Percentage of employee contributions contributed by employer towards employee benefit plan | 50.00% |  |  |
Maximum percentage of employee's eligible compensation | 3.00% |  |  |
Contributions by employer | 991 | 904 | 848 |
Minimum percentage of tax benefit realized upon settlement | 50.00% |  |  |
Advertising expenses | 2,918 | 3,098 | 1,400 |
Allowance for doubtful accounts | 6,722 | 7,096 |  |
Bad debt expense | 702 | 97 | 2,052 |
Write off of bad debts | 1,076 | 1,575 | 274 |
Notional amount of outstanding forward contract | 34,676 | 187,676 |  |
Net gains (losses) recognized in financial income, net | (240) | 10,848 | 6,048 |
Number of outstanding option contracts | 16,762,000 |  |  |
Cash flow hedge gain reclassified to operating expense | $ 208 | $ 428 |  |
Anti-dilutive shares excluded from computation of earnings per share amount | 1,342,904 | 1,147,378 | 8,386,309 |

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