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Noncontrolling Interests - In Investment Entities and in Operating Company (Details)
$ in Thousands
1 Months Ended 12 Months Ended
Jan. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
Noncontrolling Interest [Line Items]        
Acquisition of noncontrolling interests   $ 4,830   $ 2,557
Noncontrolling interest, decrease from deconsolidation   $ 330,980 $ 4,000  
OP Units to common stock, conversion ratio   1    
Class A Common Stock        
Noncontrolling Interest [Line Items]        
Acquisition of noncontrolling interests     $ 5,085  
Issuance of shares (in shares) | shares   2,074,457 1,684,170  
OP Units        
Noncontrolling Interest [Line Items]        
OP Units to common stock, conversion ratio   1 1  
OP units redeemed (in shares) | shares   2,870,422 2,076,214  
Partners' capital account, units redeemed for cash (in shares) | shares   795,965    
OP units redeemed, cash settlement   $ 4,800 $ 5,100  
Additional Paid-in Capital        
Noncontrolling Interest [Line Items]        
Acquisition of noncontrolling interests   34,100 21,800 $ (18,557)
Additional Paid-in Capital | Class A Common Stock        
Noncontrolling Interest [Line Items]        
Acquisition of noncontrolling interests   $ (29,014) $ (22,814)  
Healthcare        
Noncontrolling Interest [Line Items]        
Noncontrolling interest sold, percentage 18.70%      
Noncontrolling interest, cost of new capital $ 9,200      
Healthcare | Additional Paid-in Capital        
Noncontrolling Interest [Line Items]        
Noncontrolling interest, decrease from deconsolidation $ 41,200      
Settlement Of Contingent Consideration | OP Units        
Noncontrolling Interest [Line Items]        
OP units redeemed (in shares) | shares   1,000,000