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Earnings per share (Tables) | 9 Months Ended
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Sep. 30, 2018
Earnings per share [Abstract] |
Basic and Diluted Net Income per Share | The following table presents the calculation of basic and diluted net income per share:
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
(in thousands, except share and per share data) |  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 20,945 |  |  | $ | 33,551 |  |  | $ | 66,181 |  |  | $ | 48,652 |
Interest expense on convertible debt, net of tax |  |  | - |  |  |  | 704 |  |  |  | - |  |  |  | 2,445 |
Amortization of convertible debt issuance costs, net of tax |  |  | - |  |  |  | 195 |  |  |  | - |  |  |  | 586 |
Net income, adjusted |  | $ | 20,945 |  |  | $ | 34,450 |  |  | $ | 66,181 |  |  | $ | 51,683 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average number of shares—basic |  |  | 50,071,632 |  |  |  | 41,222,504 |  |  |  | 49,851,082 |  |  |  | 40,989,813 |
Dilutive securities—equity awards |  |  | 1,415,364 |  |  |  | 1,148,857 |  |  |  | 1,338,598 |  |  |  | 1,003,794 |
Dilutive securities—convertible debt |  |  | - |  |  |  | 8,096,468 |  |  |  | - |  |  |  | 8,096,481 |
Weighted-average number of shares—diluted |  |  | 51,486,996 |  |  |  | 50,467,829 |  |  |  | 51,189,680 |  |  |  | 50,090,088 |
Net income per share - basic |  | $ | 0.42 |  |  | $ | 0.81 |  |  | $ | 1.33 |  |  | $ | 1.19 |
Net income per share - diluted |  | $ | 0.41 |  |  | $ | 0.68 |  |  | $ | 1.29 |  |  | $ | 1.03 |

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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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