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Earnings per Share and Earnings per Unit | 9 Months Ended
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Sep. 30, 2015
Earnings Per Share [Abstract] |
Earnings per Share and Earnings per Unit | Earnings per Share and Earnings per Unit Earnings per Share of the Company Basic earnings per share (“EPS”) is computed by dividing net income attributable to common shareholders by the weighted-average number of common shares outstanding for the period. Diluted EPS assumes the issuance of common stock for all potential dilutive common shares outstanding. The limited partners’ rights to convert their noncontrolling interests in the Operating Partnership into shares of common stock are not dilutive. The following summarizes the impact of potential dilutive common shares on the denominator used to compute EPS:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2015 |  | 2014 |  | 2015 |  | 2014
Denominator – basic | 170,494 |  |  | 170,262 |  |  | 170,470 |  |  | 170,242 |
Effect of performance stock units (1) | — |  |  | — |  |  | 30 |  |  | — |
Denominator – diluted | 170,494 |  |  | 170,262 |  |  | 170,500 |  |  | 170,242 |
(1) | Performance stock units are contingently issuable common shares and are included in earnings per share if the effect is dilutive. See Note 13 for a description of the long-term incentive program, which was adopted in 2015, that these units relate to.
Earnings per Unit of the Operating Partnership Basic earnings per unit (“EPU”) is computed by dividing net income attributable to common unitholders by the weighted-average number of common units outstanding for the period. Diluted EPU assumes the issuance of common units for all potential dilutive common units outstanding. The following summarizes the impact of potential dilutive common units on the denominator used to compute EPU:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2015 |  | 2014 |  | 2015 |  | 2014
Denominator – basic | 199,751 |  |  | 199,631 |  |  | 199,728 |  |  | 199,699 |
Effect of performance stock units (1) | — |  |  | — |  |  | 30 |  |  | — |
Denominator – diluted | 199,751 |  |  | 199,631 |  |  | 199,758 |  |  | 199,699 |
(1) | Performance stock units are contingently issuable common units and are included in earnings per unit if the effect is dilutive. See Note 13 for a description of the long-term incentive program, which was adopted in 2015, that these units relate to.

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- Definition The entire disclosure for earnings per share. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: 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=7655603&loc=d3e1252-109256 Reference 4: 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=32703322&loc=d3e4984-109258 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=26872669&loc=d3e20235-122688 + Details
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