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Earnings Per Share - Anti-dilutive Shares (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Anti-dilutive effect of the calculation of net dilutive potential shares of common stock issuable
Net dilutive potential common shares issuable (shares)	167	154	195
On exercise of options where exercise price is greater than average market value for the period
Anti-dilutive effect of the calculation of net dilutive potential shares of common stock issuable
Net dilutive potential common shares issuable (shares)	96	154	195
On exercise of options and vesting of performance-based restricted stock units
Anti-dilutive effect of the calculation of net dilutive potential shares of common stock issuable
Net dilutive potential common shares issuable (shares)	54
On settlement of ESPP
Anti-dilutive effect of the calculation of net dilutive potential shares of common stock issuable
Net dilutive potential common shares issuable (shares)	17

X

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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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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