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The Nature of Expenses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Depreciation, property, plant and equipment $ 18,347 $ 15,272
Cost of Revenues [Member]    
Depreciation, property, plant and equipment 8,600 5,965
Operating Expenses [Member]    
Depreciation, property, plant and equipment $ 9,747 $ 9,307