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Significant Accounting Policies (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2017
Accounting Policies [Abstract]    
Redeemable non-controlling interests, Beginning $ 27,235  
Net income attributable to redeemable non-controlling interest 3,111  
Increase in value of put options of redeemable non-controlling interests 7,471  
Dividend declared to redeemable non-controlling interest (3,395)  
Acquisition of redeemable non-controlling interests (4,604)  
Foreign currency translation adjustments 1,996  
Redeemable non-controlling interest reclassification to non-controlling interest (9,899) $ (2,440)
Redeemable non-controlling interests, Ending $ 21,915