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Other Assets (Tables)
12 Months Ended
Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Schedule of Other Assets

Other assets consist of the following:

 

December 31,  2018   2017 
         
Patents, at cost  $6,955   $6,814 
Accumulated amortization   (4,491)   (4,202)
Deposits on capital items   12,106    7,958 
Other   3,093    3,169 
   $17,663   $13,739