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Earnings Per Share | 12 Months Ended
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Dec. 31, 2018
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings Per Share Basic earnings per share is calculated by dividing net income available to common stockholders by the weighted-average number of common shares outstanding. Diluted earnings per share is calculated by dividing net income available to common stockholders by the weighted-average number of common shares outstanding including dilutive securities. The following is a reconciliation of the calculation of basic and diluted earnings per share (in thousands, except share and per-share data):
| Years Ended December 31,
| 2018 |  | 2017 |  | 2016
Numerator: |  |  |  |  |
Net income attributable to common stockholders | $ | 87,784 |  |  | $ | 91,877 |  |  | $ | 114,796 |
Denominator: |  |  |  |  |
Weighted-average number of common shares outstanding—basic | 205,462,911 |  |  | 200,784,450 |  |  | 201,079,573 |
Effect of dilutive securities: |  |  |  |  |
Unvested restricted common stock | 215,655 |  |  | 188,759 |  |  | 47,468 |
Shares related to unvested PSUs | 452,584 |  |  | 548,259 |  |  | 549,217 |
Weighted-average number of common shares outstanding—diluted | 206,131,150 |  |  | 201,521,468 |  |  | 201,676,258 |
Earnings per share: |  |  |  |  |
Net income per share available to common stockholders—basic | $ | 0.43 |  |  | $ | 0.46 |  |  | $ | 0.57 |
Net income per share available to common stockholders—diluted | $ | 0.43 |  |  | $ | 0.46 |  |  | $ | 0.57 |
The OP units held by the noncontrolling interest holders have been excluded from the denominator of the diluted earnings per share calculation as there would be no effect on the amounts since the OP units' share of income or loss would also be added or subtracted to derive net income (loss) available to common stockholders.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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