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Equity Based Plans - Amended and Restated Employee Stock Option Plans (Details) - shares	Dec. 31, 2020	Mar. 17, 2016	Mar. 16, 2016
Share-based Compensation [Abstract]
Number of shares authorized (in shares)	2,700,000
Number of common shares available for grant (in shares)	232,535
Amended 2003 Plan [Member]
Share-based Compensation [Abstract]
Number of shares authorized (in shares)	2,100,000	2,100,000	1,750,000
Number of common shares available for grant (in shares)	224,760
Maximum [Member] | Non Qualified Stock Options [Member]
Share-based Compensation [Abstract]
Number of shares authorized (in shares)	600,000
Maximum [Member] | Amended 2003 Plan [Member]
Share-based Compensation [Abstract]
Number of common shares available for grant (in shares)	2,100,000

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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)
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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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