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Net Income Per Share (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Reconciliation of Basic and Diluted Net Income Per Share | The following is a reconciliation of basic to diluted net income per share:
|  | Years Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 339,132 |  |  | $ | 104,809 |  |  | $ | 122,297 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Shares used in net income per common share — basic |  |  | 54,137,000 |  |  |  | 53,472,000 |  |  |  | 53,282,000 |
Effect of dilutive securities |  |  | 937,000 |  |  |  | 579,000 |  |  |  | 278,000 |
Shares used in net income per common share — diluted |  |  | 55,074,000 |  |  |  | 54,051,000 |  |  |  | 53,560,000 |
Net income per common share: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 6.26 |  |  | $ | 1.96 |  |  | $ | 2.30 |
Diluted |  | $ | 6.16 |  |  | $ | 1.94 |  |  | $ | 2.28 |

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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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