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Other Assets
 12 Months Ended
Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Other Assets
6.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 

 

The capitalized cost of patents is amortized using the straight-line method over their useful lives. The cost of patent amortization was $0.3 million, $0.3 million, and $0.3 million in 2018, 2017, and 2016, respectively. The estimated annual patent amortization cost for each of the next five years is $0.3 million. Costs incurred to maintain existing patents are charged to expense in the year incurred.