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Earnings Per Share (Narrative) (Details) - shares | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |  |  |  |
Weighted average nonvested restricted shares outstanding | 2,800,000 | 3,600,000 | 2,800,000 | 3,800,000
Weighted average number of OP units outstanding | 553,000 | 347,000 | 553,000 | 347,000
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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