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Net Income Per Share (Tables) | 6 Months Ended
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Jun. 30, 2017
Earnings Per Share [Abstract] |
Reconciliation of Basic and Diluted Net Income Per Share | The following table sets forth the computation of basic and diluted net income per share:
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 120,440 |  |  | $ | 9,210 |  |  | $ | 185,500 |  |  | $ | 26,773 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares used in net income per common share – basic |  |  | 54,178,000 |  |  |  | 53,461,000 |  |  |  | 53,973,000 |  |  |  | 53,348,000 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock units, stock appreciation rights and shares issued under employee stock purchase plan |  |  | 823,000 |  |  |  | 345,000 |  |  |  | 1,006,000 |  |  |  | 337,000 |
Shares used in net income per common share – diluted |  |  | 55,001,000 |  |  |  | 53,806,000 |  |  |  | 54,979,000 |  |  |  | 53,685,000 |
Net income per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 2.22 |  |  | $ | 0.17 |  |  | $ | 3.44 |  |  | $ | 0.50 |
Diluted |  | $ | 2.19 |  |  | $ | 0.17 |  |  | $ | 3.37 |  |  | $ | 0.50 |

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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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