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Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
3 Months Ended 9 Months Ended
Feb. 22, 2018
Jan. 23, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Class of Stock [Line Items]            
Income attributable to noncontrolling interests     $ (3,547) $ (2,902) $ (9,265) $ (9,483)
Series C Cumulative Preferred Stock            
Class of Stock [Line Items]            
Depositary shares outstanding (in shares)     4.2   4.2  
Depository shares to cumulative redeemable preferred stock ratio         1.00%  
Cumulative redeemable preferred stock liquidation preference (in usd per share)     $ 25.00   $ 25.00  
Annual dividend on depositary shares (in usd per share)         $ 1.71875  
Percentage of redeemable preferred stock         6.875%  
Depositary shares redeemed during period (in shares) 3.0          
Series D Cumulative Redeemable Preferred Stock            
Class of Stock [Line Items]            
Depositary shares outstanding (in shares)   3.0        
Net proceeds from shares sold   $ 72,600        
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%