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Capital - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Aug. 23, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Class of Stock [Line Items]        
Gross proceeds from sale of shares   $ 0 $ 611,278 $ 621,800
Shares and Units [Abstract]        
OP units outstanding (in shares)   300,416,821    
OP units owned by the Company (in shares)   159,427,448    
OP units owned by the Company (as a percent)   53.10%    
OP units not owned by the Company (in shares)   140,989,373    
OP units not owned by the Company (as a percent)   46.90%    
Dividends on common stock received until performance criteria met for LTIP units (as a percent)   10.00%    
Dividends on common stock received after performance criteria met for LTIP units (as a percent)   90.00%    
Dividends on common stock received in periods after performance criteria met for LTIP units (as a percent)   100.00%    
Series PR operating partnership units        
Shares and Units [Abstract]        
OP units not owned by the Company (in shares)   93,203,688   93,075,441
Common shares | Common class A shares        
Class of Stock [Line Items]        
Issuance of common shares (in shares)       29,610,854
Common shares issued (in dollars per share)       $ 21.00
General partner | Series PR operating partnership units        
Class of Stock [Line Items]        
Issuance of common shares (in shares) 29,610,854     29,610,854
QIA        
Class of Stock [Line Items]        
Economic interest held by QIA 9.90%