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General (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
 1 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended
Nov. 30, 2012
May 31, 2012
Dec. 31, 2011
May 31, 2009
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Federmann Group [Member]
Dec. 31, 2011
UTI Netcity [Member]
Dec. 31, 2010
UTI Netcity [Member]
Oct. 31, 2012
FV [Member]
Sep. 30, 2011
FV [Member]
Dec. 31, 2012
FV [Member]
Dec. 31, 2011
FV [Member]
Business Acquisition [Line Items]                            
Ownership percentage         51.00%     46.75%            
Ownership percentage, common stock                         59.40%  
Amount of export authorization to supply systems to foreign customers     $ 90,000                      
Operating expenses     72,800   612,815 616,350 590,517              
Operating expenses, net of taxes     62,000                      
Amount of advances and performance guarantees forfeited   33,600                        
Amount sought in litigation for damages and expenses 74,000     16,000                    
Additions to equity method investments         2,789       8,100 2,700        
Impairment loss         616 15,977 1,284         16,000    
Impairment loss related to non-controlling interest                       6,500    
Net impairment loss                       9,500    
Net assets                         1,172 1,748
Consideration for sale of investment                     2,000      
Down payment received for sale of held-for-sale investment                         $ 100