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Stock-Based Compensation - Stock Incentive Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Stock-based payment awards
Shares withheld to cover tax withholding (in shares)	236,752	212,080	167,382
Shares withheld to cover tax withholding (in dollars)	$ 1,804	$ 2,007	$ 1,759
2020 Plan
Stock-based payment awards
Number of shares authorized for issuance	8,500,000
Reduction in number of shares available for issuance for each stock-settled award granted	1

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- Definition

The reduction in number of shares available for issuance for each stock-settled award granted under the Plan.

+ References

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Amount of decrease to equity for grantee's tax withholding obligation for award under share-based payment arrangement.

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- Definition

Number of shares authorized for issuance under share-based payment arrangement.

+ 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)(3)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement.

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