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Commitments, Contingencies and Guarantees (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Other Commitments [Line Items]      
Redeemable noncontrolling interests   $ 55,730 $ 62,886
Investment commitments   80  
Amount of letters of credit outstanding   5,248  
Minimum      
Other Commitments [Line Items]      
Redeemable noncontrolling interest obligation, year of payment 2018    
Maximum      
Other Commitments [Line Items]      
Redeemable noncontrolling interest obligation, year of payment 2023    
Contractual redemption right      
Other Commitments [Line Items]      
Redemption value   13,330  
Contractual redemption right | Common Class A      
Other Commitments [Line Items]      
Redemption value   154  
Termination or death redemption right      
Other Commitments [Line Items]      
Redemption value   37,003  
Excess initial redemption value      
Other Commitments [Line Items]      
Redemption value   $ 5,397