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Fair Value Measurement (Details 1) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Fair Value Measurement [Abstract]          
Carrying amount $ 58,062 $ 56,378 $ 52,876 $ 46,484 $ 46,484
Net income attributable to redeemable non-controlling interests 1,591 928 4,702 2,104 3,671
Adjustments in redeemable non-controlling interests to fair value 596 351 1,985 5,765  
Increase in redeemable non-controlling interest as part of acquisitions 1,042 6,662    
Redeemable non-controlling interests classification to non-controlling due to change in terms and expiration of put options     (2,183)  
Redeemable non-controlling interests classification to non-controlling due to change in terms (1,187)      
Exercise of put option by redeemable non-controlling interests (142)  
Share-based compensation attributable to redeemable non-controlling Interests         52
Change in redeemable non-controlling interests to fair value         4,872
Redeemable non-controlling interests classification to non-controlling Interests due to expiration of put options         (2,440)
Dividend to redeemable non-controlling interests (677) (2,088) (2,404) (3,236) (3,928)
Foreign currency translation adjustments 2 (483) (2,067) 3,969 4,165
Carrying amount $ 59,429 $ 55,086 $ 59,429 $ 55,086 $ 52,876