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Earnings Per Common Share - Narrative (Details) - shares
1 Months Ended 3 Months Ended
Dec. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Earnings Per Share [Abstract]      
Maximum shares issuable under forward equity sales agreement (in shares) 15,250,000    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Incremental Common Shares Attributable to Dilutive Effect of Equity Forward Agreements   1,093,000 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)   6,000,000 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
Convertible Units [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Shares of anti-dilutive securities excluded from earnings per share calculation (in shares)   18,000,000  
At-The-Market Program 2019      
Earnings Per Share [Abstract]      
Maximum shares issuable under forward equity sales agreement (in shares)   3,600,000  
Option indexed to issuers equity, term   1 year