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Segment Information (Detail Textuals) - Segment
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]      
Number of segments managed 3    
International Customers | Customer Concentration Risk | Sales      
Segment Reporting Information [Line Items]      
Concentration Risk, Percentage 41.10% 34.20% 28.10%