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Earnings Per Share (Narrative) (Details) - shares |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Aug. 01, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |  |  |  |  |
Weighted average nonvested restricted shares outstanding |  | 3,800,000 | 3,700,000 | 3,800,000 | 3,600,000
Anti-dilutive common stock shares excluded from earnings per share amount |  |  | 5,750,000 |  | 5,750,000
Weighted average number of OP units outstanding |  | 349,000 | 352,000 | 350,000 | 352,000
Forward Sales Agreements [Member] |  |  |  |  |
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |  |  |  |  |
Settlement date of agreements | Aug. 01, 2017 |  |  | Aug. 01, 2017 |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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