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Taxes On Income (Narrative) (Details) | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2012 USD ($) item | Dec. 31, 2011 USD ($) | Dec. 31, 2010 | Dec. 31, 2012 Internal Revenue Service (IRS) [Member] USD ($) | Dec. 31, 2012 Domestic Tax Authority [Member] USD ($) | Dec. 31, 2012 Law for the Encouragement of Industry (Taxes) [Member] | Dec. 31, 2012 Law for the Encouragement of Capital Investments [Member] ILS | Dec. 31, 2012 NORWAY USD ($) | Dec. 31, 2012 BRAZIL USD ($) | Dec. 31, 2012 Minimum [Member] | Dec. 31, 2012 Minimum [Member] Internal Revenue Service (IRS) [Member] | Dec. 31, 2012 Minimum [Member] Domestic Tax Authority [Member] | Dec. 31, 2012 Minimum [Member] Law for the Encouragement of Capital Investments [Member] | Dec. 31, 2012 Minimum [Member] Foreign Tax Authority [Member] | Dec. 31, 2012 Maximum [Member] | Dec. 31, 2012 Maximum [Member] Internal Revenue Service (IRS) [Member] | Dec. 31, 2012 Maximum [Member] Domestic Tax Authority [Member] | Dec. 31, 2012 Maximum [Member] Law for the Encouragement of Capital Investments [Member] | Dec. 31, 2012 Maximum [Member] Foreign Tax Authority [Member] | Dec. 31, 2012 Develpment Area A [Member] Law for the Encouragement of Capital Investments [Member]
Taxes On Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period of accelerated depreciation for tax purposes |  |  |  |  |  | 8 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Israeli tax rate | 25.00% | 24.00% | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period of tax exemption |  |  |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |
Tax rate reduction percent |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  | 25.00% |  |
Period in which investment must be made |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum qualifying investment |  |  |  |  |  |  | 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Experation period since approval | 14 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Experation period since enterpise began operating | 12 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Experation period since beginning of the year of election | 12 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign investors' company tax benefits period | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign investors' company tax benefits pecent |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  | 25.00% |  |  |  |  |
Number of capital investment programs granted approved enterprise status | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of capital investment programs under beneficiary enterprise status | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amended tax rate 2011 and 2012 |  |  |  |  |  |  | 15.00% |  |  |  |  |  |  |  |  |  |  |  |  | 10.00%
Amended tax rate 2013 and 2014 |  |  |  |  |  |  | 12.50% |  |  |  |  |  |  |  |  |  |  |  |  | 7.00%
Amended tax rate 2015 and thereafter |  |  |  |  |  |  | 12.00% |  |  |  |  |  |  |  |  |  |  |  |  | 6.00%
Valuation allowance | 72,588,000 | 59,018,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net operating losses |  |  |  | 2,300,000 | 60,000,000 |  |  | 98,000,000 | 11,300,000 |  |  |  |  |  |  |  |  |  |  |
Israeli capital loss |  |  |  |  | 3,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual limit against taxable income |  |  |  |  |  |  |  |  | 30.00% |  |  |  |  |  |  |  |  |  |  |
Accrued interest and penalties | $ 51,000 | $ 1,624,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Open Tax Year |  |  |  |  |  |  |  |  |  |  | 2008 | 2008 |  | 2007 |  | 2011 | 2011 |  | 2011 |

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