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Certain Balance Sheet Components (Schedule of Property, Plant and Equipment) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Property Plant And Equipment [Abstract]    
Property, plant and equipment $ 492,798 $ 472,695
Less: accumulated depreciation (214,211) (200,502)
Total property, plant and equipment, net $ 278,587 $ 272,193