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Inventories
12 Months Ended
Dec. 31, 2014
Inventories [Abstract]  
Inventories
(4)Inventories

 

  December 31,  
    2014     2013  
Raw materials and component parts   $ 36,383     $ 47,800  
Finished goods     65,943       69,547  
    $ 102,326     $ 117,347