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Employee Benefits and Share-Based Compensation - Narrative (Details) - USD ($) |  |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Mar. 05, 2019 | Feb. 13, 2019 | Mar. 06, 2018 | Feb. 06, 2018 | Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares reserved for future issuance (in shares) |  |  |  |  |  | 9,010,000 |  |
Income tax benefits from employee stock plans |  |  |  |  |  |  |  | $ 11,000
Share-based compensation expense |  |  |  |  |  | $ 34,049,000 | $ 28,885,000 | 21,857,000
Omnicell Plan | Other Postretirement Benefit Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Employer matching contribution, percent of employee contribution |  |  |  |  |  | 50.00% |  |
Maximum amount of employer contribution |  |  |  |  |  | $ 3,000 |  |
401(k) contributions |  |  |  |  |  | $ 5,100,000 | $ 4,600,000 | 3,800,000
Stock Options |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares reserved for future issuance (in shares) |  |  |  |  |  | 3,902,000 |  |
Stock Options Impacted by Modifications |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  | $ 200,000 |  |  |
Unrecognized compensation cost of unvested stock options |  |  |  |  |  | $ 600,000 |  |
Remaining weighted-average vesting period |  |  |  |  |  | 1 year 10 months 24 days |  |
ESPP |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares reserved for future issuance (in shares) |  |  |  |  |  | 1,539,000 |  |
PSUs |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Trading days used for stock price appreciation calculation |  | 20 days |  | 20 days |  |  |  |
PSUs | Officer |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Awards granted (in shares) |  |  |  |  |  | 61,098 | 110,432 |
1997 Plan | ESPP |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Maximum percentage of earnings allowed for purchase of shares |  |  |  |  |  | 15.00% |  |
Maximum fair market value of shares |  |  |  |  |  | $ 25,000 |  |
Purchase price of common stock, percent |  |  |  |  |  | 85.00% |  |
Offering period |  |  |  |  |  | 24 months |  |
Purchasing period |  |  |  |  |  | 6 months |  |
Shares reserved for future issuance (in shares) |  |  |  |  |  | 1,500,000 |  |
Weighted average period of compensation cost recognized |  |  |  |  |  | 1 year 3 months 18 days |  |
Shares purchased under ESPP (in shares) |  |  |  |  |  | 374,000 |  |
Weighted-average price (in dollars per share) |  |  |  |  |  | $ 41.44 |  |
Unrecognized compensation cost |  |  |  |  |  | $ 1,600,000 |  |
2009 Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares reserved for future issuance (in shares) |  |  |  |  |  | 7,500,000 |  |
Income tax benefits from employee stock plans |  |  |  |  |  | $ 11,000,000.0 | $ 6,500,000 | $ 8,200,000
2009 Plan | Stock Options |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vesting period (in years) |  |  |  |  |  | 4 years |  |
Unrecognized compensation cost of unvested stock options |  |  |  |  |  | $ 39,500,000 |  |
Remaining weighted-average vesting period |  |  |  |  |  | 7 years 8 months 12 days |  |
Weighted-average fair value per share (in dollars per share) |  |  |  |  |  | $ 23.54 | $ 17.22 | $ 13.25
Intrinsic value of options exercised |  |  |  |  |  | $ 32,800,000 | $ 20,100,000 | $ 18,200,000
Weighted average period of compensation cost recognized |  |  |  |  |  | 2 years 9 months 18 days |  |
2009 Plan | Stock Options | Vesting One Year from Commencement Date |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vesting period (in years) |  |  |  |  |  | 1 year |  |
Percentage of award vesting |  |  |  |  |  | 25.00% |  |
2009 Plan | Stock Options | Vesting in Equal Monthly Installments |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vesting period (in years) |  |  |  |  |  | 36 months |  |
2009 Plan | RSUs |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vesting period (in years) |  |  |  |  |  | 4 years |  |
Weighted average period of compensation cost recognized |  |  |  |  |  | 3 years |  |
Awards granted (in shares) |  |  |  |  |  | 277,000 |  |
Weighted-average grant date fair value per award granted (in dollars per share) |  |  |  |  |  | $ 78.49 | $ 59.52 | $ 45.97
Fair value of awards vested |  |  |  |  |  | $ 10,600,000 | $ 7,900,000 | $ 6,500,000
Total unrecognized compensation cost |  |  |  |  |  | $ 31,500,000 |  |
2009 Plan | RSUs | Vesting One Year from Commencement Date |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vesting period (in years) |  |  |  |  |  | 1 year |  |
Percentage of award vesting |  |  |  |  |  | 25.00% |  |
2009 Plan | RSUs | Vesting in Equal Monthly Installments |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vesting period (in years) |  |  |  |  |  | 3 years |  |
2009 Plan | RSAs |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Weighted average period of compensation cost recognized |  |  |  |  |  | 4 months 24 days |  |
Awards granted (in shares) |  |  |  |  |  | 17,000 |  |
Weighted-average grant date fair value per award granted (in dollars per share) |  |  |  |  |  | $ 81.86 | $ 46.60 | $ 41.10
Fair value of awards vested |  |  |  |  |  | $ 1,000,000.0 | $ 1,000,000.0 | $ 1,000,000.0
Total unrecognized compensation cost |  |  |  |  |  | $ 500,000 |  |
2009 Plan | PSUs |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Weighted average period of compensation cost recognized |  |  |  |  |  | 1 year 3 months 18 days |  |
Awards granted (in shares) |  |  |  |  |  | 71,000 |  |
Weighted-average grant date fair value per award granted (in dollars per share) |  |  |  |  |  | $ 73.38 | $ 38.03 | $ 34.05
Fair value of awards vested |  |  |  |  |  | $ 3,500,000 | $ 3,200,000 | $ 2,600,000
Total unrecognized compensation cost |  |  |  |  |  | $ 3,100,000 |  |
2017 Performance Based Restricted Stock Units | PSUs |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vesting period (in years) |  |  |  |  |  | 36 months |  |
Awards eligible for vesting (in shares) |  |  | 147,830 |  |  |  |  |
Percentage of award vesting |  |  | 25.00% |  |  |  |  |
Awards vested by period end (in shares) |  |  |  |  |  | 81,322 |  |
Percentile rank of stockholder return |  |  | 60.00% |  |  |  |  |
Percentage of shares eligible for time-based vesting |  |  | 100.00% |  |  |  |  |
2018 Performance Based Restricted Stock Units | PSUs |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vesting period (in years) |  |  |  |  |  | 36 months |  |
Awards eligible for vesting (in shares) | 110,432 |  |  |  |  |  |  |
Percentage of award vesting | 25.00% |  |  |  |  |  |  |
Awards vested by period end (in shares) |  |  |  |  |  | 46,376 |  |
Percentile rank of stockholder return | 90.00% |  |  |  |  |  |  |
Percentage of shares eligible for time-based vesting | 100.00% |  |  |  |  |  |  |

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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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