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Subsequent Events - Redemptions (Details)
 3 Months Ended
Apr. 05, 2018
shares
Mar. 31, 2018
$ / shares
Mar. 31, 2017
Dec. 31, 2017
$ / shares
5.5% Series C Participating Preferred Shares        
Subsequent Event [Line Items]        
Preferred stock, dividend rate, percentage   5.50% 5.50%  
Class A common shares/units        
Subsequent Event [Line Items]        
Common shares, par value (in dollars per share) | $ / shares   $ 0.01   $ 0.01
Subsequent Event | 5.5% Series C Participating Preferred Shares        
Subsequent Event [Line Items]        
Stock converted during period (in shares) 7,600,000      
Subsequent Event | Class A common shares/units        
Subsequent Event [Line Items]        
Issuance of common shares, net of offering costs (in shares) 10,848,827      
Stock exchange ratio 1.4275