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Share-Based Compensation - Restricted Stock Units Awards Narrative (Details) - Restricted Stock Units - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based compensation
Recognized share-based compensation expense	$ 3.5	$ 4.4	$ 4.0
Unrecognized compensation cost, net of estimated forfeitures, related to restricted stock unit awards	$ 5.8
Weighted-average period over which unrecognized compensation cost is expected to be recognized	2 years 6 months

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
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-Section S99
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+ References

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- Definition

Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

+ References

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-Section 50
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