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Earnings Per Share ("EPS") and Earnings Per Unit ("EPU") (Details 2) - shares shares in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Conversion of common units |  |
Antidilutive securities |  |
Antidilutive securities excluded from computation of diluted earnings per share (in shares) | 1,331 | 3,221
Conversion of redeemable noncontrolling interests |  |
Antidilutive securities |  |
Antidilutive securities excluded from computation of diluted earnings per share (in shares) | 1,013 | 0
Conversion of Series I preferred units |  |
Antidilutive securities |  |
Antidilutive securities excluded from computation of diluted earnings per share (in shares) | 176 | 176
Weighted average shares related to forward equity sale agreements |  |
Antidilutive securities |  |
Antidilutive securities excluded from computation of diluted earnings per share (in shares) | 1,500 | 7,500
Weighted average restricted shares/units and deferred shares |  |
Antidilutive securities |  |
Antidilutive securities excluded from computation of diluted earnings per share (in shares) | 463 | 444
Weighted average options |  |
Antidilutive securities |  |
Antidilutive securities excluded from computation of diluted earnings per share (in shares) | 30 | 60
Weighted average unvested PIUs |  |
Antidilutive securities |  |
Antidilutive securities excluded from computation of diluted earnings per share (in shares) | 19 |
Corporate Office Properties, L.P. | Conversion of redeemable noncontrolling interests |  |
Antidilutive securities |  |
Antidilutive securities excluded from computation of diluted earnings per share (in shares) | 1,013 | 0
Corporate Office Properties, L.P. | Conversion of Series I preferred units |  |
Antidilutive securities |  |
Antidilutive securities excluded from computation of diluted earnings per share (in shares) | 176 | 176
Corporate Office Properties, L.P. | Weighted average shares related to forward equity sale agreements |  |
Antidilutive securities |  |
Antidilutive securities excluded from computation of diluted earnings per share (in shares) | 1,500 | 7,500
Corporate Office Properties, L.P. | Weighted average restricted shares/units and deferred shares |  |
Antidilutive securities |  |
Antidilutive securities excluded from computation of diluted earnings per share (in shares) | 463 | 444
Corporate Office Properties, L.P. | Weighted average options |  |
Antidilutive securities |  |
Antidilutive securities excluded from computation of diluted earnings per share (in shares) | 30 | 60
Corporate Office Properties, L.P. | Weighted average unvested PIUs |  |
Antidilutive securities |  |
Antidilutive securities excluded from computation of diluted earnings per share (in shares) | 19 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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