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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted | 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 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + 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 + Details
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