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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2018
Accounting Policies [Abstract] |
Schedule of Calculation of Numerator and Denominator in EPS | The following table sets forth the computation of basic and diluted earnings per share (in thousands, except per share amounts):
| Year Ended December 31,
| 2018 |  | 2017 |  | 2016
Numerator: |  |  |  |  |
Net income | $ | 153,206 |  |  | $ | 143,892 |  |  | $ | 60,127 |
Denominator: |  |  |  |  |
Weighted-average common shares for calculating basic earnings per share | 44,777 |  |  | 47,854 |  |  | 34,997 |
Effect of dilutive securities: |  |  |  |  |
Stock options and restricted stock unit awards | 107 |  |  | 34 |  |  | 7 |
Weighted-average common shares for calculating diluted earnings per share | 44,884 |  |  | 47,888 |  |  | 35,004 |
Earnings per share: |  |  |  |  |
Basic | $ | 3.42 |  |  | $ | 3.01 |  |  | $ | 1.72 |
Diluted | 3.41 |  |  | 3.00 |  |  | 1.72 |

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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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