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Goodwill (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Goodwill [Line Items]    
Goodwill, January 1, $ 14,593 $ 1,093
Foreign currency translation adjustments 690 [1],[2],[3] (158) [1],[2],[3]
Goodwill, December 31, 15,283 14,593
Nera [Member]
    
Goodwill [Line Items]    
Acquisition   $ 13,658
[1] The allocation period of Nera's acquisition ended in July 2012.
[2] Adjustment of goodwill related to acquisition of Nera.
[3] Foreign currency translation differences resulting from goodwill allocated to subsidiaries, whose functional currency has been determined to be other than the U.S. dollar and adjustment related to provisions.