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Stock-Based Plans - Narrative (Details) - Executives - $ / shares | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Restricted stock units |  |  |
Stock-Based Plans |  |  |
Granted (in shares) |  | 1,065,139 | 603,111
Granted, weighted average grant date fair value (in dollars per share) |  | $ 36.45 | $ 57.88
Post-vest holding period ( in years ) | 3 years | 3 years |
Vesting period ( in years ) | 3 years |  |
Stock Options |  |  |
Stock-Based Plans |  |  |
Options awarded (in shares) |  | 392,841 | 33,615
Options awarded, weighted average exercise price (in dollars per share) |  | $ 29.03 | $ 58.15
Vesting period ( in years ) | 3 years | 3 years |
Term of stock-based award ( in years ) | 10 years | 10 years |
Stock-based VDI units |  |  |
Stock-Based Plans |  |  |
Granted (in shares) |  | 350,532 | 206,598
Vesting period ( in years ) | 3 years | 3 years |
Stock-based VDI units | 2016 VDI Plan |  |  |
Stock-Based Plans |  |  |
Post-vest holding period ( in years ) |  | 3 years |
Expected amount of shares granted (in shares) |  | 83,068 |
Expected weighted average grant date fair value (in dollars per share) |  | $ 35.18 |
Stock-based VDI units | 2017 VDI Plan |  |  |
Stock-Based Plans |  |  |
Post-vest holding period ( in years ) |  | 3 years |
Expected amount of shares granted (in shares) |  | 68,866 |
Expected weighted average grant date fair value (in dollars per share) |  | $ 42.24 |
Stock-based VDI units | 2018 VDI Plan |  |  |
Stock-Based Plans |  |  |
Expected amount of shares granted (in shares) |  | 116,844 |
Expected weighted average grant date fair value (in dollars per share) |  | $ 39.72 |

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- Definition Represents the required holding period after an employee has met the vesting criteria of a share-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The expected 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 No definition available. + Details
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- Definition The expected weighted average fair value at grant date for nonvested equity-based awards issued 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 No definition available. + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + 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://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued 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://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + 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 (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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