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Earnings Per Share (Narrative) (Details) - shares
12 Months Ended
Aug. 01, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Weighted average nonvested restricted shares outstanding   3,000,000 3,800,000 3,600,000
Anti-dilutive common stock shares excluded from earnings per share amount     5,750,000  
Weighted average number of OP units outstanding   429,000 350,000 352,000
Market Performance-Based Equity Award [Member] | Chief Executive Officer [Member]        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Shares issuable under Stock incentive plan   0    
Forward Sales Agreements [Member]        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Settlement date of agreements Aug. 01, 2017