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Stock Compensation Plans - Option Groups Outstanding (Details) - $ / shares | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Options outstanding (in shares) | 8,700,732 | 4,998,021
Options exercisable (in shares) | 4,462,091 |
Options remaining contractual term | 5 years 10 months 24 days |
Grant Date February 25 2020 |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Options outstanding (in shares) | 4,142,384 |
Options exercisable (in shares) | 0 |
Options exercise price (in dollars per share) | $ 10.12 |
Options remaining contractual term | 9 years 1 month 28 days |
Grant Date February 27 2017 |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Options outstanding (in shares) | 556,409 |
Options exercisable (in shares) | 465,203 |
Options exercise price (in dollars per share) | $ 35.26 |
Options remaining contractual term | 6 years 1 month 28 days |
Grant Date February 22 2016 |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Options outstanding (in shares) | 542,625 |
Options exercisable (in shares) | 542,625 |
Options exercise price (in dollars per share) | $ 29.90 |
Options remaining contractual term | 5 years 1 month 24 days |
Grant Date February 23 2015 |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Options outstanding (in shares) | 493,730 |
Options exercisable (in shares) | 493,730 |
Options exercise price (in dollars per share) | $ 27.16 |
Options remaining contractual term | 4 years 1 month 24 days |
Grant Date February 24 2014 |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Options outstanding (in shares) | 381,617 |
Options exercisable (in shares) | 381,617 |
Options exercise price (in dollars per share) | $ 26.44 |
Options remaining contractual term | 3 years 1 month 24 days |
Grant Date February 28 2013 |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Options outstanding (in shares) | 904,580 |
Options exercisable (in shares) | 904,580 |
Options exercise price (in dollars per share) | $ 12.98 |
Options remaining contractual term | 2 years 1 month 28 days |
Grant Date February 27 2012 |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Options outstanding (in shares) | 721,878 |
Options exercisable (in shares) | 721,878 |
Options exercise price (in dollars per share) | $ 12.94 |
Options remaining contractual term | 1 year 1 month 28 days |
Grant Date February 22 2011 |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Options outstanding (in shares) | 523,979 |
Options exercisable (in shares) | 523,979 |
Options exercise price (in dollars per share) | $ 13.91 |
Options remaining contractual term | 1 month 24 days |
All Other Grant Dates |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Options outstanding (in shares) | 433,530 |
Options exercisable (in shares) | 428,479 |
Options remaining contractual term | 3 years |

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option 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)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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