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Stock compensation (Tables) | 3 Months Ended
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Mar. 31, 2019
Stock compensation |
Schedule of valuation assumptions used for valuation of fair value of stock compensation granted | We utilized the Black-Scholes valuation model for estimating the fair value of the stock compensation granted, with the following weighted-average assumptions:
|  | Employee Stock Options |  | Employee Stock Purchase Plan |
|  | For the Three Months Ended March 31, |  |
|  | 2019 |  | 2018 |  |  | 2019 |  | 2018 |  |
Average risk-free interest rates |  | 2.51 | % | 2.42 | % |  | 2.27 | % | 2.26 | % |
Average expected life (in years) |  | 5.33 |  | 5.53 |  |  | 0.25 |  | 0.25 |  |
Volatility |  | 45 | % | 45 | % |  | 34 | % | 36 | % |
Weighted-average fair value (in dollars) |  | 31.50 |  | 41.59 |  |  | 13.31 |  | 18.17 |  |
Schedule of option activity under the 2010 Stock Plan | Option activity under the 2010 Stock Plan was as follows:
|  |  |  | Shares Subject to |
|  |  |  | Outstanding Options |
|  | Shares Available |  |  |  | Weighted Average |
|  | for Grant |  | Shares |  | Exercise Price |
Balance at December 31, 2018 |  | 6,477,577 |  | 12,285,159 |  | $ | 74.39 |
Options granted |  | (2,271,592) |  | 2,271,592 |  | $ | 72.81 |
Options exercised |  | — |  | (849,870) |  | $ | 25.38 |
Options cancelled |  | 315,321 |  | (315,321) |  | $ | 89.29 |
Balance at March 31, 2019 |  | 4,521,306 |  | 13,391,560 |  | $ | 76.88 |
Schedule of RSU award and PSU activity under the 2010 Stock Plan | RSU award and PSU activity under the 2010 Stock Plan was as follows:
|  |  |  | Shares Subject to |
|  | Shares Available |  | Outstanding Awards |
|  | for Grant |  | Shares |  | Grant Date Value |
Balance at December 31, 2018 |  | 545,751 |  | 2,043,337 |  | $ | 80.35 |
RSUs granted |  | (165,251) |  | 165,251 |  | $ | 73.69 |
PSUs achieved |  | (44,940) |  | 44,940 |  | $ | 65.76 |
RSUs cancelled |  | 55,591 |  | (55,591) |  | $ | 89.46 |
PSUs cancelled |  | 9,889 |  | (9,889) |  | $ | 67.32 |
RSUs released |  | — |  | (213,604) |  | $ | 89.38 |
Balance at March 31, 2019 |  | 401,040 |  | 1,974,444 |  | $ | 78.29 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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