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Other Assets (Schedule of Other Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Patents, at cost $ 10,024 $ 9,859
Accumulated amortization (5,360) (5,071)
Deposits on capital items 18,026 22,255
Marlin trade name 7,800 7,800
Other 8,953 6,779
Other assets $ 39,443 $ 41,622