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Net income per share (Tables) | 9 Months Ended
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Sep. 30, 2019
Net income per share |
Schedule of calculation of net income per share | Net income per share was calculated as follows for the periods indicated below:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three Months Ended | ​ | Nine Months Ended
​ |  | September 30, |  | September 30,
(in thousands, except per share data) |  |  | 2019 |  | 2018 |  |  | 2019 |  | 2018
Basic Net Income Per Share | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Basic net income | ​ | $ | 128,271 | ​ | $ | 29,176 | ​ | $ | 335,901 | ​ | $ | 40,430
Weighted average common shares outstanding | ​ | ​ | 215,199 | ​ | ​ | 212,627 | ​ | ​ | 214,628 | ​ | ​ | 212,172
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Basic net income per share | ​ | $ | 0.60 | ​ | $ | 0.14 | ​ | $ | 1.57 | ​ | $ | 0.19
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Diluted Net Income Per Share | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Diluted net income | ​ | $ | 128,271 | ​ | $ | 29,176 | ​ | $ | 335,901 | ​ | $ | 40,430
Weighted average common shares outstanding | ​ | ​ | 215,199 | ​ | ​ | 212,627 | ​ | ​ | 214,628 | ​ | ​ | 212,172
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Dilutive stock options and awards | ​ | ​ | 2,592 | ​ | ​ | 3,337 | ​ | ​ | 2,765 | ​ | ​ | 3,344
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted average shares used to compute diluted net income per share | ​ | ​ | 217,791 | ​ | ​ | 215,964 | ​ | ​ | 217,393 | ​ | ​ | 215,516
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Diluted net income per share | ​ | $ | 0.59 | ​ | $ | 0.14 | ​ | $ | 1.55 | ​ | $ | 0.19
Schedule of antidilutive securities excluded from the computation of earnings per share | The following potential common shares were excluded from the calculations as their effect would be anti-dilutive:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Nine Months Ended | ​
​ | ​ | September 30, | ​ | September 30, | ​
​ |  | 2019 |  | 2018 |  | 2019 |  | 2018 |
Outstanding stock options and awards |  | 8,893,596 | ​ | 9,055,004 | ​ | 9,457,441 | ​ | 7,254,774 |
Common shares issuable upon conversion of the 2018 Notes |  | — | ​ | 148,741 | ​ | — | ​ | 148,741 |
Common shares issuable upon conversion of the 2020 Notes |  | 368,939 | ​ | 368,939 | ​ | 368,939 | ​ | 368,939 |
Total potential common shares excluded from diluted net income (loss) per share computation |  | 9,262,535 |  | 9,572,684 |  | 9,826,380 |  | 7,772,454 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + 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 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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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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