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Shareholders' Equity / Partners' Capital - Participating Preferred Shares (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Apr. 05, 2018
shares
Oct. 03, 2017
shares
Sep. 30, 2018
USD ($)
$ / shares
shares
Mar. 31, 2018
USD ($)
shares
Sep. 30, 2017
USD ($)
$ / shares
shares
Jun. 30, 2017
USD ($)
$ / shares
shares
Mar. 31, 2017
shares
Jun. 30, 2016
USD ($)
shares
Jun. 30, 2014
USD ($)
shares
Dec. 31, 2013
USD ($)
shares
Mar. 31, 2014
USD ($)
shares
Dec. 31, 2018
USD ($)
market
$ / shares
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
Class of Stock [Line Items]                            
Preferred shares, shares outstanding (in shares) | shares                       35,350,000 38,350,000  
Current Liquidation Value                       $ 883,750 $ 986,986  
Liquidation preference per share (in dollars per share) | $ / shares                       $ 25.00    
Number of top markets used for purchase price index | market                       20    
Dividend rate, percentage cap                       9.00%    
Series C Preferred Stock                            
Class of Stock [Line Items]                            
Cumulative annual cash dividend rate                 5.50%     5.50% 5.50% 5.50%
Preferred shares, shares outstanding (in shares) | shares                       0 7,600,000  
Current Liquidation Value                       $ 0 $ 218,236  
Liquidation preference per share (in dollars per share) | $ / shares                       $ 25    
Preferred units issued (in shares) | shares                 7,600,000          
Gross proceeds from issuance of Preferred shares before offering costs                 $ 190,000          
Offering costs                 $ 9,700          
Series D Perpetual Preferred Shares/Units                            
Class of Stock [Line Items]                            
Cumulative annual cash dividend rate               6.50%       6.50%    
Preferred shares, shares outstanding (in shares) | shares                       10,750,000 10,750,000  
Current Liquidation Value                       $ 268,750 $ 268,750  
Issuance of perpetual preferred shares, net of offering costs (in shares) | shares               10,750,000            
Gross proceeds under issuance of preferred shares               $ 268,800            
Offering costs               $ 8,500            
Series E Perpetual Preferred Stock                            
Class of Stock [Line Items]                            
Cumulative annual cash dividend rate               6.35%       6.35%    
Preferred shares, shares outstanding (in shares) | shares                       9,200,000 9,200,000  
Current Liquidation Value                       $ 230,000 $ 230,000  
Issuance of perpetual preferred shares, net of offering costs (in shares) | shares               9,200,000            
Gross proceeds under issuance of preferred shares               $ 230,000            
Offering costs               $ 7,500            
Series F Perpetual Preferred Stock                            
Class of Stock [Line Items]                            
Cumulative annual cash dividend rate           5.875%           5.875%    
Preferred shares, shares outstanding (in shares) | shares                       6,200,000 6,200,000  
Current Liquidation Value                       $ 155,000 $ 155,000  
Liquidation preference per share (in dollars per share) | $ / shares           $ 25.00                
Issuance of perpetual preferred shares, net of offering costs (in shares) | shares           6,200,000                
Gross proceeds under issuance of preferred shares           $ 155,000                
Offering costs           $ 5,300                
Series G Perpetual Preferred Stock                            
Class of Stock [Line Items]                            
Cumulative annual cash dividend rate         5.875%             5.875%    
Preferred shares, shares outstanding (in shares) | shares                       4,600,000 4,600,000  
Current Liquidation Value                       $ 115,000 $ 115,000  
Liquidation preference per share (in dollars per share) | $ / shares         $ 25.00                  
Issuance of perpetual preferred shares, net of offering costs (in shares) | shares         4,600,000                  
Gross proceeds under issuance of preferred shares         $ 115,000                  
Offering costs         $ 4,100                  
Series H Perpetual Preferred Stock                            
Class of Stock [Line Items]                            
Cumulative annual cash dividend rate     6.25%                 6.25%    
Preferred shares, shares outstanding (in shares) | shares                       4,600,000 0  
Current Liquidation Value                       $ 115,000 $ 0  
Liquidation preference per share (in dollars per share) | $ / shares     $ 25.00                 $ 25    
Issuance of perpetual preferred shares, net of offering costs (in shares) | shares     4,600,000                      
Gross proceeds under issuance of preferred shares     $ 115,000                      
Offering costs     $ 4,400                      
Class A common shares/units                            
Class of Stock [Line Items]                            
Percent of cumulative change in value of an index 50.00% 50.00%                   50.00%    
Redemptions of Class A units (in shares) | shares 10,848,827                          
Stock exchange ratio 1.4275                          
Issuance of perpetual preferred shares, net of offering costs (in shares) | shares     13,800,000 14,842,982     36,546,170              
Offering costs     $ 9,200 $ 400               $ 0 $ 10,637 $ 227
Series B Participating Preferred Stock                            
Class of Stock [Line Items]                            
Cumulative annual cash dividend rate   5.00%                 5.00% 5.00% 5.00% 5.00%
Preferred shares, shares outstanding (in shares) | shares   4,400,000                        
Liquidation preference per share (in dollars per share) | $ / shares                       $ 25    
Preferred units issued (in shares) | shares                     4,400,000      
Gross proceeds from issuance of Preferred shares before offering costs                     $ 110,000      
Offering costs                     $ 6,600      
Series A Participating Preferred Stock                            
Class of Stock [Line Items]                            
Cumulative annual cash dividend rate   5.00%               5.00%     5.00% 5.00%
Preferred shares, shares outstanding (in shares) | shares   5,060,000                        
Redemptions of Class A units (in shares) | shares   12,398,276                        
Preferred units issued (in shares) | shares                   5,060,000        
Gross proceeds from issuance of Preferred shares before offering costs                   $ 126,500        
Offering costs                   $ 7,300