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Significant Accounting Policies (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounting Policies [Abstract]      
Redeemable non-controlling interests, Beginning $ 25,839    
Net income attributable to redeemable non-controlling interest 3,383 $ 1,536 $ 2,258
Increase in value of put options of redeemable non-controlling interests 1,726    
Dividend declared to redeemable non-controlling interest (1,979)    
Foreign currency translation adjustments (1,734)    
Redeemable non-controlling interests, Ending $ 27,235 $ 25,839