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Earnings Per Share | 12 Months Ended
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Dec. 31, 2017
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 that has been adjusted for dilutive securities, 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,
| 2017 |  | 2016 |  | 2015
Numerator: |  |  |  |  |
Net income | $ | 91,877 |  |  | $ | 114,796 |  |  | $ | 85,630 |
Denominator: |  |  |  |  |
Weighted-average number of common shares outstanding—basic | 200,784,450 |  |  | 201,079,573 |  |  | 200,796,678 |
Effect of dilutive securities: |  |  |  |  |
Unvested restricted common stock | 188,759 |  |  | 47,468 |  |  | 129,640 |
Shares related to unvested PSUs | 548,259 |  |  | 549,217 |  |  | 533,092 |
Unexercised stock appreciation rights | — |  |  | — |  |  | 524 |
Weighted-average number of common shares outstanding—diluted | 201,521,468 |  |  | 201,676,258 |  |  | 201,459,934 |
Earnings per share: |  |  |  |  |
Basic earnings per share | $ | 0.46 |  |  | $ | 0.57 |  |  | $ | 0.43 |
Diluted earnings per share | $ | 0.46 |  |  | $ | 0.57 |  |  | $ | 0.43 |
We did not include the unexercised stock appreciation rights of 20,770 for the years ended December 31, 2017 and 2016 as they would be anti-dilutive.

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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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