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Income Taxes - Tax Rate Reconciliation (Details)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Income Taxes    
Federal income tax expense at statutory rate 21.00% 21.00%
Effect of:    
Tax effects of foreign operations 597.80% (34.00%)
Foreign operations permanent difference - foreign exchange gains and losses 355.30% 104.20%
Increase in unrecognized tax benefits (ASC 740) 165.10% (36.80%)
State income tax net of federal benefit 39.80%  
Withholding tax 22.90%  
Return to provision true up 1.20% (28.00%)
Foreign rate differential (85.50%) (8.10%)
Change in valuation allowance (193.30%) (7.90%)
Other (130.20%) (4.60%)
Effective tax rate 794.10% 5.80%