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Share-Based Compensation - Summary of Share-Based Compensation (income) expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Summary of share-based compensation expense
Share-based compensation expense (benefit)	$ 1,763	$ (2,145)
Share-based compensation expense before income tax	1,763	(2,145)
Income tax benefit	(27)	(109)
Share-based compensation (income) expense, net of income tax	1,736	(2,254)
Performance-based Restricted Stock Units ("PBRS")
Summary of share-based compensation expense
Share-based compensation expense (benefit)	140	(2,635)
Share-based compensation expense before income tax	140	(2,635)
Restricted Stock Awards And Restricted Stock Units
Summary of share-based compensation expense
Share-based compensation expense (benefit)	1,244	490
Share-based compensation expense before income tax	1,244	$ 490
Stock Options
Summary of share-based compensation expense
Share-based compensation expense (benefit)	379
Share-based compensation expense before income tax	$ 379

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- Definition

Amount, after tax, of expense for award under share-based payment arrangement.

+ References

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- Definition

Amount of tax benefit for recognition of expense of award 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 (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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Allocated share based compensation expense benefit.

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