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Earnings Per Share ("EPS") (Details 2) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Conversion of common units |  |  |  |
Antidilutive securities |  |  |  |
Antidilutive securities excluded from computation of diluted earnings per share (in shares) | 3,804 | 4,233 | 3,832 | 4,256
Conversion of Series I Preferred Units |  |  |  |
Antidilutive securities |  |  |  |
Antidilutive securities excluded from computation of diluted earnings per share (in shares) | 176 | 176 | 176 | 176
Conversion of Series K Preferred Shares |  |  |  |
Antidilutive securities |  |  |  |
Antidilutive securities excluded from computation of diluted earnings per share (in shares) | 434 | 434 | 434 | 434
Weighted average restricted shares |  |  |  |
Antidilutive securities |  |  |  |
Antidilutive securities excluded from computation of diluted earnings per share (in shares) | 377 | 420 | 388 | 475
Weighted average options |  |  |  |
Antidilutive securities |  |  |  |
Antidilutive securities excluded from computation of diluted earnings per share (in shares) | 613 | 752 | 571 | 780
Corporate Office Properties, L.P. | Weighted average restricted shares |  |  |  |
Antidilutive securities |  |  |  |
Antidilutive securities excluded from computation of diluted earnings per share (in shares) | 377 | 420 | 388 | 475
Corporate Office Properties, L.P. | Weighted average options |  |  |  |
Antidilutive securities |  |  |  |
Antidilutive securities excluded from computation of diluted earnings per share (in shares) | 613 | 752 | 571 | 780
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 | 176 | 176
Corporate Office Properties, L.P. | Conversion of Series K Preferred Units |  |  |  |
Antidilutive securities |  |  |  |
Antidilutive securities excluded from computation of diluted earnings per share (in shares) | 434 | 434 | 434 | 434

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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 -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 3: 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 4: 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 + Details
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