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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 |

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