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Income per Share | 9 Months Ended
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Sep. 30, 2018
Earnings Per Share [Abstract] |
Income per Share | Income per Share The following is a summary of basic and diluted income per share (in thousands, except share and per share amounts):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Net income (loss) available to common stockholders | $ | 67,268 |  |  | $ | (4,140 | ) |  | $ | 218,700 |  |  | $ | 119,842 |
Weighted average shares outstanding—basic | 206,118,472 |  |  | 170,194,254 |  |  | 205,931,031 |  |  | 163,481,306 |
Potentially dilutive common shares: |  |  |  |  |  |  |
Unvested incentive units | 169,100 |  |  | — |  |  | 160,117 |  |  | 150,369 |
Forward equity offering | 37,884 |  |  | — |  |  | 1,847 |  |  | 166,493 |
Market performance-based awards | 440,800 |  |  | — |  |  | 462,632 |  |  | 572,928 |
Weighted average shares outstanding—diluted | 206,766,256 |  |  | 170,194,254 |  |  | 206,555,627 |  |  | 164,371,096 |
Income (loss) per share: |  |  |  |  |  |  |
Basic | $ | 0.33 |  |  | $ | (0.02 | ) |  | $ | 1.06 |  |  | $ | 0.73 |
Diluted | $ | 0.33 |  |  | $ | (0.02 | ) |  | $ | 1.06 |  |  | $ | 0.73 |
We have excluded the following potentially dilutive securities in the calculations above as they would be antidilutive or not dilutive:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Weighted average of Operating Partnership common units not owned by Digital Realty Trust, Inc. | 8,170,912 |  |  | 3,266,451 |  |  | 8,268,382 |  |  | 2,566,766 |
Potentially dilutive Series C Cumulative Redeemable Perpetual Preferred Stock | 1,727,724 |  |  | 329,709 |  |  | 1,864,489 |  |  | 109,903 |
Potentially dilutive Series F Cumulative Redeemable Preferred Stock | — |  |  | — |  |  | — |  |  | 617,734 |
Potentially dilutive Series G Cumulative Redeemable Preferred Stock | 2,142,282 |  |  | 2,193,331 |  |  | 2,311,864 |  |  | 2,262,875 |
Potentially dilutive Series H Cumulative Redeemable Preferred Stock | 3,139,291 |  |  | 3,214,098 |  |  | 3,387,795 |  |  | 3,316,008 |
Potentially dilutive Series I Cumulative Redeemable Preferred Stock | 2,144,789 |  |  | 2,195,898 |  |  | 2,314,569 |  |  | 2,265,524 |
Potentially dilutive Series J Cumulative Redeemable Preferred Stock | 1,711,186 |  |  | 1,045,730 |  |  | 1,846,643 |  |  | 348,577 |
Total | 19,036,184 |  |  | 12,245,217 |  |  | 19,993,742 |  |  | 11,487,387 |

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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 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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