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Fair Value Measurement (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Assets:    
Total financial assets $ 1,638,573 $ 1,563,637
Fair value measurements [Member]    
Assets:    
Government and corporate debentures 10,756 12,929
Convertible debentures 1,163 1,209
Dividend preference derivative in TSG [1] 2,400 2,400
Total financial assets 14,319 16,538
Liabilities:    
Redeemable non-controlling interests [2] 59,429 52,876
Contingent consideration [2] 10,724 6,345
Total financial liabilities 70,153 59,221
Fair value measurements [Member] | Level 1 [Member]    
Assets:    
Government and corporate debentures
Convertible debentures
Dividend preference derivative in TSG [1]
Total financial assets
Liabilities:    
Redeemable non-controlling interests [2]
Contingent consideration [2]
Total financial liabilities
Fair value measurements [Member] | Level 2 [Member]    
Assets:    
Government and corporate debentures 10,756 12,929
Convertible debentures 1,163 1,209
Dividend preference derivative in TSG [1]
Total financial assets 11,919 14,138
Liabilities:    
Redeemable non-controlling interests [2]
Contingent consideration [2]
Total financial liabilities
Fair value measurements [Member] | Level 3 [Member]    
Assets:    
Government and corporate debentures
Convertible debentures
Dividend preference derivative in TSG [1] 2,400 2,400
Total financial assets 2,400 2,400
Liabilities:    
Redeemable non-controlling interests [2] 59,429 52,876
Contingent consideration [2] 10,724 6,345
Total financial liabilities $ 70,153 $ 59,221
[1] The fair value of dividend preference derivative in TSG was estimated using the Monte-Carlo simulation technique.
[2] The fair value of redeemable non-controlling interests and contingent consideration was determined based on the present value of the future expected cash flow.