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Taxes (Details)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
China Statutory income tax rate 25.00% 25.00% 25.00%
Effect of favorable income tax rate in certain entity in PRC (1.40%) (2.80%) (3.00%)
Non-PRC entities not subject to PRC tax [1] 6.30% 4.50% 3.00%
Research & Development ("R&D") tax credit [2] (1.10%) (0.30%) (0.50%)
Non-deductible expenses-permanent difference [3] 0.20% 0.00% 1.10%
Change in valuation allowance (3.30%) 2.90% 4.60%
Effective tax rate 25.70% 29.30% 30.20%
[1] Represents the tax losses incurred from operations outside of China.
[2] According to PRC tax regulations, 150% of current year R&D expense approved by the local tax authority may be deducted from tax income.
[3] Represents expenses incurred by the Company that were not deductible for PRC income tax.