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Certain Balance Sheet Components (Schedule of Property, Plant and Equipment) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Property Plant And Equipment [Abstract]    
Property, plant and equipment $ 503,753 $ 498,113
Less: accumulated depreciation (216,872) (211,730)
Total property, plant and equipment, net $ 286,881 $ 286,383