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Stock compensation (Tables) | 6 Months Ended
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Jun. 30, 2018
Stock compensation |
Schedule of valuation assumptions used for valuation of fair value of stock compensation granted |
|  | Employee Stock Options |  | Employee Stock Purchase Plan |
|  | For the Three Months Ended | For the Six Months Ended |  | For the Three Months Ended | For the Six Months Ended |
|  | June 30, |  | June 30, |
|  | 2018 |  | 2017 |  | 2018 |  | 2017 |  |  | 2018 |  | 2017 |  | 2018 |  | 2017 |  |
Average risk-free interest rates |  | 2.71 | % | 1.56 | % | 2.47 | % | 1.79 | % |  | 2.52 | % | 1.38 | % | 2.50 | % | 1.31 | % |
Average expected life (in years) |  | 5.37 |  | 5.41 |  | 5.50 |  | 5.36 |  |  | 0.50 |  | 0.50 |  | 0.50 |  | 0.50 |  |
Volatility |  | 46 | % | 50 | % | 45 | % | 49 | % |  | 30 | % | 42 | % | 51 | % | 42 | % |
Weighted-average fair value (in dollars) |  | 28.65 |  | 60.44 |  | 39.47 |  | 52.87 |  |  | 12.11 |  | 17.55 |  | 16.25 |  | 18.80 |  |
Schedule of option activity under the 2010 Stock Plan |
|  |  |  | Shares Subject to |
|  |  |  | Outstanding Options |
|  | Shares Available |  |  |  | Weighted Average |
|  | for Grant |  | Shares |  | Exercise Price |
Balance at December 31, 2017 |  | 3,909,701 |  | 11,206,553 |  | $ | 68.36 |
Additional authorization |  | 5,000,000 |  | — |  |  | — |
Options granted |  | (1,565,286) |  | 1,565,286 |  | $ | 89.67 |
Options exercised |  | — |  | (844,619) |  | $ | 22.03 |
Options cancelled |  | 244,146 |  | (244,146) |  | $ | 100.67 |
Balance at June 30, 2018 |  | 7,588,561 |  | 11,683,074 |  | $ | 73.89 |
Schedule of RSU award and PSU activity under the 2010 Stock Plan |
|  |  |  | Shares Subject to |
|  | Shares Available |  | Outstanding Awards |
|  | for Grant |  | Shares |  | Grant Date Value |
Balance at December 31, 2017 |  | 769,202 |  | 1,178,660 |  | $ | 98.88 |
Additional authorization |  | 1,000,000 |  | — |  |  | — |
RSUs granted |  | (322,593) |  | 322,593 |  | $ | 73.90 |
PSUs granted |  | (446,500) |  | 446,500 |  | $ | 65.76 |
RSUs cancelled |  | 43,588 |  | (43,588) |  | $ | 103.70 |
RSUs released |  | — |  | (176,590) |  | $ | 81.70 |
Balance at June 30, 2018 |  | 1,043,697 |  | 1,727,575 |  | $ | 87.29 |
Schedule of summary of share activity |
|  | Shares Issued |
|  | and Outstanding |
Balance at December 31, 2017 |  | 211,262,906 |
Exercise of stock options and issuance under ESPP |  | 997,470 |
Settlement of employee restricted stock units |  | 148,199 |
Conversion of convertible senior notes |  | 577 |
Balance at June 30, 2018 |  | 212,409,152 |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock options plan and employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References No definition available. + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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