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Earnings Per Share ("EPS") and Earnings Per Unit ("EPU") (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Numerator: |  |  |  |
Net income attributable to COPT/COPLP | $ 19,434 | $ 17,526 | $ 36,584 | $ 38,545
'Preferred share/unit dividends/distributions | 0 | (3,039) | 0 | (6,219)
Issuance costs associated with redeemed preferred shares/units | 0 | (6,847) | 0 | (6,847)
Income attributable to share-based compensation awards | (117) | (117) | (234) | (242)
Numerator for basic and diluted EPS on net income attributable to COPT/COPLP common share/unit holders | $ 19,317 | $ 7,523 | $ 36,350 | $ 25,237
Denominator (all weighted averages): |  |  |  |
Denominator for basic EPS/EPU (common shares/units) | 101,789 | 99,036 | 101,397 | 98,725
Dilutive effect of share-based compensation awards (shares) | 119 | 160 | 131 | 158
Denominator for diluted EPS/EPU (common shares/units) | 101,908 | 99,196 | 101,528 | 98,883
Basic EPS: |  |  |  |
Net income attributable to COPT/COPLP common shareholders - basic (in dollars per share/unit) | $ 0.19 | $ 0.08 | $ 0.36 | $ 0.26
Diluted EPS: |  |  |  |
Net income attributable to COPT/COPLP common shareholders - diluted (in dollars per share/unit) | $ 0.19 | $ 0.08 | $ 0.36 | $ 0.26
Corporate Office Properties, L.P. |  |  |  |
Numerator: |  |  |  |
Net income attributable to COPT/COPLP | $ 20,207 | $ 17,952 | $ 38,066 | $ 39,758
'Preferred share/unit dividends/distributions | (165) | (3,204) | (330) | (6,549)
Issuance costs associated with redeemed preferred shares/units | 0 | (6,847) | 0 | (6,847)
Income attributable to share-based compensation awards | (117) | (117) | (234) | (242)
Numerator for basic and diluted EPS on net income attributable to COPT/COPLP common share/unit holders | $ 19,925 | $ 7,784 | $ 37,502 | $ 26,120
Denominator (all weighted averages): |  |  |  |
Denominator for basic EPS/EPU (common shares/units) | 104,986 | 102,441 | 104,605 | 102,150
Dilutive effect of share-based compensation awards (shares) | 119 | 160 | 131 | 158
Denominator for diluted EPS/EPU (common shares/units) | 105,105 | 102,601 | 104,736 | 102,308
Basic EPS: |  |  |  |
Net income attributable to COPT/COPLP common shareholders - basic (in dollars per share/unit) | $ 0.19 | $ 0.08 | $ 0.36 | $ 0.26
Diluted EPS: |  |  |  |
Net income attributable to COPT/COPLP common shareholders - diluted (in dollars per share/unit) | $ 0.19 | $ 0.08 | $ 0.36 | $ 0.26

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- Definition The amount of net income (loss) for the period 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 Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -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 -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=96948231&loc=d3e4984-109258 Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1252-109256 Reference 5: 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=63488584&loc=d3e20235-122688 Reference 6: 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 + Details
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- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1252-109256 Reference 3: 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=63488584&loc=d3e20235-122688 Reference 4: 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 + Details
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