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Certain Balance Sheet Components (Schedule of Property, Plant and Equipment) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Property Plant And Equipment [Abstract]    
Property, plant and equipment $ 538,251 $ 259,437
Less: accumulated depreciation (198,105) (182,208)
Total property, plant and equipment, net $ 340,146 $ 77,229