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The Nature of Expenses (Tables)
 12 Months Ended
Dec. 31, 2018
Nature of Expenses [Abstract]  
Disclosure of detailed information about depreciation of property plant and equipment [Text Block] Depreciation of property, plant and equipment
 
 
 
Year ended December 31,
 
 
 
2017
 
 
2018
 
 
 
(in thousands)
 
Recognized in cost of revenues
 
$
5,965
 
 
 
8,600
 
Recognized in operating expenses
 
 
9,307
 
 
 
9,747
 
 
 
$
15,272
 
 
 
18,347
 
Disclosure of detailed information about Amortization of intangible assets [Text Block] Amortization of intangible assets
 
 
 
Year ended December 31,
 
 
 
2017
 
 
2018
 
 
 
(in thousands)
 
Recognized in cost of revenues
 
$
2
 
 
 
3
 
Recognized in operating expenses
 
 
1,406
 
 
 
1,977
 
 
 
$
1,408
 
 
 
1,980
 
Disclosure of detailed information about employee benefit expense [Text Block] Employee benefits expense
 
 
 
Year ended December 31,
 
 
 
2017
 
 
2018
 
 
 
(in thousands)
 
Salary
 
$
89,911
 
 
 
91,822
 
Labor and health insurance
 
 
5,841
 
 
 
6,054
 
Pension
 
 
5,102
 
 
 
5,474
 
Others
 
 
3,486
 
 
 
3,576
 
 
 
$
104,340
 
 
 
106,926
 
 
 
 
 
 
 
 
 
 
Employee benefits expense summarized by function
 
 
 
 
 
 
 
 
Recognized in cost of revenues
 
$
5,223
 
 
 
6,512
 
Recognized in operating expenses
 
 
99,117
 
 
 
100,414
 
 
 
$
104,340
 
 
 
106,926