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Earnings Per Share (Narrative) (Details) - shares
3 Months Ended 6 Months Ended 12 Months Ended
Aug. 01, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]            
Weighted average nonvested restricted shares outstanding   3,600,000 3,800,000 3,800,000 3,800,000  
Anti-dilutive common stock shares excluded from earnings per share amount           5,750,000
Weighted average number of OP units outstanding   347,000 351,000 347,000 351,000  
Forward Sales Agreements [Member]            
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]            
Settlement date of agreements Aug. 01, 2017