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Earnings Per Common Share - Narrative (Details) - shares
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Earnings Per Share [Abstract]            
Maximum shares issuable under forward equity sales agreement (in shares)   13,750,000   13,750,000.00    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Dilutive potential common shares - forward equity agreements (in shares)   0 0 (1,344,000) 0  
Down REIT            
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Shares of anti-dilutive securities excluded from earnings per share calculation (in shares)   7,000,000 7,000,000 7,000,000 7,000,000  
Employee stock option            
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Shares of anti-dilutive securities excluded from earnings per share calculation (in shares)   1,000,000 1,000,000 1,000,000 1,000,000  
Convertible Units            
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Shares of anti-dilutive securities excluded from earnings per share calculation (in shares)   22,000,000   21,000,000    
Forward Equity Offering            
Earnings Per Share [Abstract]            
Maximum shares issuable under forward equity sales agreement (in shares) 15,250,000 13,600,000.0   13,600,000    
Option indexed to issuers equity, term 1 year     1 year    
Issuance of common stock, net (in shares)   1,500,000   1,500,000    
At-The-Market Program 2018            
Earnings Per Share [Abstract]            
Share settlement (in shares)   5,500,000   5,500,000    
Issuance of common stock, net (in shares)           5,400,000