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Stockholders’ Equity - RSU and PSU award activity (Details) - $ / shares | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2014
Shares Available For Grant |  |  |  |  |  |
Shares Available for Grant Beginning Balance (in shares) |  |  | 769,202 |  |  |
Additional authorization (in shares) |  |  | 1,000,000 |  |  |
Shares Available for Grant Ending Balance (in shares) |  |  | 545,751 | 769,202 |  |
Shares Subject to Outstanding Options, Shares |  |  |  |  |  |
Outstanding at the beginning of the period (in shares) |  |  | 1,178,660 |  |  |
Outstanding at the end of the period (in shares) |  |  | 2,043,337 | 1,178,660 |  |
Shares Subject to Outstanding Options, Weighted Average Exercise Price |  |  |  |  |  |
Outstanding at the beginning of the period (in dollars per share) |  |  | $ 98.88 |  |  |
Outstanding at the end of the period (in dollars per share) |  |  | $ 80.35 | $ 98.88 |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |
Shares Available For Grant |  |  |  |  |  |
Granted (in shares) |  |  | (898,598) |  |  |
Cancelled (in shares) |  |  | 120,591 |  |  |
Shares Subject to Outstanding Options, Shares |  |  |  |  |  |
Granted (in shares) |  | 190,000 | 898,598 |  |  |
Cancelled (in shares) |  |  | (120,591) |  |  |
Released (in shares) |  |  | (358,774) |  |  |
Shares Subject to Outstanding Options, Weighted Average Exercise Price |  |  |  |  |  |
Granted (in dollars per share) |  |  | $ 70.39 |  |  |
Cancelled (in dollars per share) |  |  | 95.33 |  |  |
Released (in dollars per share) |  |  | $ 93.64 |  |  |
Performance Stock Units (PSUs) |  |  |  |  |  |
Shares Available For Grant |  |  |  |  |  |
Granted (in shares) |  |  | (523,743) |  |  |
Cancelled (in shares) |  |  | 78,299 |  |  |
Shares Subject to Outstanding Options, Shares |  |  |  |  |  |
Granted (in shares) | 77,243 | 446,500 | 523,743 | 0 | 0 | 55,326
Cancelled (in shares) |  |  | (78,299) |  |  |
Shares Subject to Outstanding Options, Weighted Average Exercise Price |  |  |  |  |  |
Granted (in dollars per share) |  |  | $ 66.18 |  |  |
Cancelled (in dollars per share) |  |  | $ 66.44 |  |  |

X
- Definition The number of shares other than options that were cancelled out of shares available for grant during the reporting period as a result of the occurrence of a terminating event specified in contractual agreements pertaining to the other than stock option plan. + References No definition available. + Details
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- Definition Represents the number of shares other than options (or share units) granted out of shares available for grant, during the period. + References No definition available. + Details
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- Definition Per share weighted average intrinsic value of equity-based compensation awards released. Excludes stock and unit options. + References No definition available. + Details
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- Definition Represents the share based compensation arrangement by share based payment award other than options number of additional shares authorized available for grant. + References No definition available. + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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