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Earnings Per Share ("EPS") (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Numerator: |  |  |  |  |  |  |  |
(Loss) income from continuing operations | $ (1,703) |  | $ 9,722 |  | $ 9,059 |  | $ 22,112 |
Gain on sales of real estate, net | 329 |  | 21 |  | 2,683 |  | 21 |
Preferred share dividends | (4,885) |  | (4,167) |  | (10,991) |  | (8,192) |
Issuance costs associated with redeemed preferred shares/units | (2,904) |  | 0 |  | (2,904) |  | 0 |
(Loss) income from continuing operations attributable to noncontrolling interests | (1,024) |  | (459) |  | (1,149) |  | (539) |
Income from continuing operations attributable to restricted shares | (102) |  | (105) |  | (220) |  | (246) |
Numerator for basic EPS from continuing operations attributable to COPT common shareholders | (10,289) |  | 5,012 |  | (3,522) |  | 13,156 |
Dilutive effect of common units in COPLP on diluted EPS from continuing operations | (543) |  | 0 |  | (214) |  | 0 |
Numerator for diluted EPS from continuing operations attributable to COPT common shareholders | (10,832) |  | 5,012 |  | (3,736) |  | 13,156 |
Discontinued operations | (3,031) |  | 2,118 |  | (870) |  | (37) |
Discontinued operations attributable to noncontrolling interests | 64 |  | (97) |  | (68) |  | 43 |
Numerator for basic EPS on net (loss) income attributable to COPT common shareholders | (13,256) |  | 7,033 |  | (4,460) |  | 13,162 |
Dilutive effect of common units in COPLP | (671) |  | 0 |  | (242) |  | 0 |
Numerator for diluted EPS on net income attributable to COPT common shareholders | (13,927) |  | 7,033 |  | (4,702) |  | 13,162 |
Denominator (all weighted averages): |  |  |  |  |  |  |  |
Denominator for basic EPS (common shares) | 85,425 |  | 71,624 |  | 83,422 |  | 71,541 |
Dilutive effect of common units | 3,801 |  | 0 |  | 3,847 |  | 0 |
Dilutive effect of share-based compensation awards | 0 |  | 25 |  | 0 |  | 35 |
Denominator for basic and diluted EPS | 89,226 |  | 71,649 |  | 87,269 |  | 71,576 |
Basic EPS: |  |  |  |  |  |  |  |
(Loss) income from continuing operations attributable to COPT common shareholders | $ (0.12) | [1] | $ 0.07 | [1] | $ (0.04) | [1] | $ 0.18 | [1]
Discontinued operations attributable to COPT common shareholders (in dollars per share) | $ (0.04) | [1] | $ 0.03 | [1] | $ (0.01) | [1] | $ 0.00 | [1]
Net income attributable to COPT common shareholders (in dollars per share) | $ (0.16) | [1] | $ 0.10 | [1] | $ (0.05) | [1] | $ 0.18 | [1]
Diluted EPS: |  |  |  |  |  |  |  |
(Loss) income from continuing operations attributable to COPT common shareholders | $ (0.12) | [1] | $ 0.07 | [1] | $ (0.04) | [1] | $ 0.18 | [1]
Discontinued operations attributable to COPT common shareholders (in dollars per share) | $ (0.04) | [1] | $ 0.03 | [1] | $ (0.01) | [1] | $ 0.00 | [1]
Net income attributable to COPT common shareholders (in dollars per share) | $ (0.16) | [1] | $ 0.10 | [1] | $ (0.05) | [1] | $ 0.18 | [1]
Corporate Office Properties, L.P. |  |  |  |  |  |  |  |
Numerator: |  |  |  |  |  |  |  |
(Loss) income from continuing operations | (1,703) |  | 9,722 |  | 9,059 |  | 22,112 |
Gain on sales of real estate, net | 329 |  | 21 |  | 2,683 |  | 21 |
Preferred share dividends | (5,050) |  | (4,332) |  | (11,321) |  | (8,522) |
Issuance costs associated with redeemed preferred shares/units | (2,904) |  | 0 |  | (2,904) |  | 0 |
(Loss) income from continuing operations attributable to noncontrolling interests | (1,408) |  | 10 |  | (1,039) |  | 586 |
Income from continuing operations attributable to restricted shares | (102) |  | (105) |  | (220) |  | (246) |
Numerator for basic and diluted EPU from continuing operations attributable to COPLP common unitholders | (10,838) |  | 5,316 |  | (3,742) |  | 13,951 |
Discontinued operations | (3,031) |  | 2,118 |  | (870) |  | (37) |
Discontinued operations attributable to noncontrolling interests | (65) |  | (9) |  | (98) |  | (15) |
Net Income (Loss) Attributable to Common Stockholders, Basic and Diluted | $ (13,934) |  | $ 7,425 |  | $ (4,710) |  | $ 13,899 |
Denominator (all weighted averages): |  |  |  |  |  |  |  |
Denominator for basic EPS (common shares) | 89,226 |  | 75,879 |  | 87,269 |  | 75,808 |
Dilutive effect of share-based compensation awards | 0 |  | 25 |  | 0 |  | 35 |
Denominator for basic and diluted EPS | 89,226 |  | 75,904 |  | 87,269 |  | 75,843 |
Basic EPS: |  |  |  |  |  |  |  |
(Loss) income from continuing operations attributable to COPT common shareholders | $ (0.12) | [2] | $ 0.07 | [2] | $ (0.04) | [2] | $ 0.18 | [2]
Discontinued operations attributable to COPT common shareholders (in dollars per share) | $ (0.04) | [2] | $ 0.03 | [2] | $ (0.01) | [2] | $ 0.00 | [2]
Net income attributable to COPT common shareholders (in dollars per share) | $ (0.16) | [2] | $ 0.10 | [2] | $ (0.05) | [2] | $ 0.18 | [2]
Diluted EPS: |  |  |  |  |  |  |  |
(Loss) income from continuing operations attributable to COPT common shareholders | $ (0.12) | [2] | $ 0.07 | [2] | $ (0.04) | [2] | $ 0.18 | [2]
Discontinued operations attributable to COPT common shareholders (in dollars per share) | $ (0.04) | [2] | $ 0.03 | [2] | $ (0.01) | [2] | $ 0.00 | [2]
Net income attributable to COPT common shareholders (in dollars per share) | $ (0.16) | [2] | $ 0.10 | [2] | $ (0.05) | [2] | $ 0.18 | [2]
[1] | Basic and diluted earnings per common share are calculated based on amounts attributable to common shareholders of Corporate Office Properties Trust.
[2] | Basic and diluted earnings per common unit are calculated based on amounts attributable to common unitholders of Corporate Office Properties, L.P.

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- Definition Amount of income (loss) from a disposal group, net of income tax before extraordinary items allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 29 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 47 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 43 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.12) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Article 7 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.14) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Article 5 + Details
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- Definition The amount of net income (loss) derived from discontinued operations during the period, net of related tax effect, per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 07-4 -Paragraph 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.23) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1278-109256 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 8, 9, 10, 36, 37, 38 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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