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Earnings Per Share (Narrative) (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Weighted average nonvested restricted shares outstanding	2,800,000	2,200,000	2,800,000	3,300,000
Weighted average number of OP units outstanding	544,000	469,000	550,000	388,000
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

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Share based compensation arrangement by share based payment award equity instruments other than options issuable during period.

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Weighted average number of operating partnership units outstanding.

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This element represents nonvested share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid). Basic and dilutive earnings per share are generally disclosed for such shares using the two-class method.

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