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Other Assets (Schedule of Other Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
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
Other assets $ 17,663 $ 13,739