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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
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,
| 2017 |  | 2016 |  | 2015
Numerator: |  |  |  |  |
Net income | $ | 143,892 |  |  | $ | 60,127 |  |  | $ | 60,710 |
Denominator: |  |  |  |  |
Weighted-average common shares for calculating basic earnings per share | 47,854 |  |  | 34,997 |  |  | 28,138 |
Effect of dilutive securities: |  |  |  |  |
Stock options and nonvested stock awards | 34 |  |  | 7 |  |  | 188 |
Weighted-average common shares for calculating diluted earnings per share | 47,888 |  |  | 35,004 |  |  | 28,326 |
Net income per share: |  |  |  |  |
Basic | $ | 3.01 |  |  | $ | 1.72 |  |  | $ | 2.16 |
Diluted | $ | 3.00 |  |  | $ | 1.72 |  |  | $ | 2.14 |

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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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