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Earnings Per Share (Narrative) (Details) - shares
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Weighted average nonvested restricted shares outstanding 2,900,000 2,800,000
Weighted average number of OP units outstanding 537,000 553,000
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 0