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Certain Balance Sheet Components (Schedule of Property, Plant and Equipment) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Property Plant And Equipment [Abstract]    
Property, plant and equipment $ 520,524 $ 517,711
Less: accumulated depreciation (229,041) (229,167)
Total property, plant and equipment, net $ 291,483 $ 288,544