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Net Income Per Share (Tables) | 12 Months Ended
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Dec. 31, 2018
Earnings Per Share [Abstract] |
Reconciliation of Basic and Diluted Net Income Per Share | The following table reconciles basic and diluted net income per share for the years indicated:
| 2018 |  | 2017 |  | 2016
|  |  | Weighted-Average Shares |  |  |  |  |  | Weighted-Average Shares |  |  |  |  |  | Weighted-Average Shares |  |
Basic net income per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common stockholders | $ | 159,139 |  |  | 49,262,015 |  |  | $ | 3.23 |  |  | $ | 96,070 |  |  | 45,181,221 |  |  | $ | 2.13 |  |  | $ | 81,051 |  |  | 40,767,343 |  |  | $ | 1.99 |
Effect of dilutive stock options and restricted stock awards |  |  | 208,908 |  |  |  |  |  |  | 221,757 |  |  |  |  |  |  | 245,790 |  |  |
Diluted net income per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common stockholders | $ | 159,139 |  |  | 49,470,923 |  |  | $ | 3.22 |  |  | $ | 96,070 |  |  | 45,402,978 |  |  | $ | 2.12 |  |  | $ | 81,051 |  |  | 41,013,133 |  |  | $ | 1.98 |

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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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