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

Share Based Compensation Options Exercise Price

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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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)
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- Definition

Number of options outstanding, including both vested and non-vested options.

+ 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
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

Weighted average remaining contractual term for option awards outstanding, 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
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