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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