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The Nature of Expenses (Details 3) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Employee benefits expense $ 106,926 $ 104,340
Cost of Revenues [Member]    
Employee benefits expense 6,512 5,223
Operating Expenses [Member]    
Employee benefits expense $ 100,414 $ 99,117