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Net Income Per Share (Tables) | 6 Months Ended
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Jun. 30, 2019
Earnings Per Share [Abstract] |
Basic and diluted net income per share | The following table reconciles basic and diluted net income per share for the three and six months ended June 30, 2019 and 2018.
| Three Months Ended June 30,
| 2019 |  | 2018
| Net Income |  | Weighted-Average Shares |  | Per Share Amount |  | Net Income |  | Weighted-Average Shares |  | Per Share Amount
Net income available to common stockholders | $ | 41,056 |  |  | 49,432,167 |  |  | $ | 0.83 |  |  | $ | 39,634 |  |  | 49,252,580 |  |  | $ | 0.80 |
Effect of potentially dilutive stock options and restricted stock awards |  |  | 117,720 |  |  |  |  |  |  | 198,826 |  |  |
Diluted net income per share | $ | 41,056 |  |  | 49,549,887 |  |  | $ | 0.83 |  |  | $ | 39,634 |  |  | 49,451,406 |  |  | $ | 0.80 |
| Six Months Ended June 30,
| 2019 |  | 2018
| Net Income |  | Weighted-Average Shares |  | Per Share Amount |  | Net Income |  | Weighted-Average Shares |  | Per Share Amount
Net income available to common stockholders | $ | 79,873 |  |  | 49,400,770 |  |  | $ | 1.62 |  |  | $ | 76,313 |  |  | 49,222,779 |  |  | $ | 1.55 |
Effect of potentially dilutive stock options and restricted stock awards |  |  | 144,382 |  |  |  |  |  |  | 217,266 |  |  |
Diluted net income per share | $ | 79,873 |  |  | 49,545,152 |  |  | $ | 1.61 |  |  | $ | 76,313 |  |  | 49,440,045 |  |  | $ | 1.54 |

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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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