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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2018
Earnings Per Share [Abstract] |
Computation of Basic and Diluted Earnings Per Share | The following table sets forth the components used in the computation of basic and diluted earnings per share (in thousands, except share and per share amounts):
| Year Ended December 31,
| 2018 |  | 2017 |  | 2016
Numerator: |  |  |  |  |  |  |  |
Income available to common stockholders | $ | 269,911 |  |  | $ | 187,191 |  |  | $ | 195,171 |
Denominator: |  |  |  |  |  |  |  |
Basic weighted-average shares outstanding | 148,183,431 |  |  | 154,134,411 |  |  | 160,859,782 |
Effect of dilutive shares: |  |  |  |  |
Stock options and unvested restricted stock units | 821,259 |  |  | 950,955 |  |  | 521,717 |
Diluted weighted-average shares outstanding | 149,004,690 |  |  | 155,085,366 |  |  | 161,381,499 |
Earnings per share |  |  |  |  |  |  |  |
Basic | $ | 1.82 |  |  | $ | 1.21 |  |  | $ | 1.21 |
Diluted | $ | 1.81 |  |  | $ | 1.21 |  |  | $ | 1.21 |
Antidilutive stock options not included in diluted earnings per share | 1,645,816 |  |  | 3,288,340 |  |  | 4,551,337 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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