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Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
3 Months Ended
Jan. 23, 2018
Mar. 31, 2019
Mar. 31, 2018
Class of Stock [Line Items]      
Income attributable to noncontrolling interests   $ 3,630 $ 2,359
Series D Cumulative Redeemable Preferred Stock      
Class of Stock [Line Items]      
Depositary shares outstanding (in shares)   3.0  
Depository shares to cumulative redeemable preferred stock ratio   1.00%  
Cumulative redeemable preferred stock liquidation preference (in usd per share) $ 25.00    
Annual dividend on depositary shares (in usd per share) $ 1.53125    
Percentage of redeemable preferred stock 6.125%    
Series C Cumulative Preferred Stock      
Class of Stock [Line Items]      
Depositary shares outstanding (in shares)   4.2  
Depository shares to cumulative redeemable preferred stock ratio   1.00%  
Cumulative redeemable preferred stock liquidation preference (in usd per share)   $ 25.00  
Annual dividend on depositary shares (in usd per share)   $ 1.71875  
Percentage of redeemable preferred stock   6.875%