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Share-Based Compensation - Summary of Share-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Summary of share-based compensation expense
Share-based compensation before income tax benefit	$ 1,831	$ 2,294	$ 6,448	$ 5,056
Income tax benefit	(460)	(580)	(1,625)	(1,276)
Share-based compensation, net of income tax benefit	1,371	1,714	4,823	3,780
Performance Unit Incentive Plan (“PUP”)
Summary of share-based compensation expense
Share-based compensation before income tax benefit	1,033	1,607	4,013	3,125
Restricted stock
Summary of share-based compensation expense
Share-based compensation before income tax benefit	687	609	2,163	1,779
Restricted stock units
Summary of share-based compensation expense
Share-based compensation before income tax benefit	$ 111	$ 78	$ 272	$ 152

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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=116856206&loc=d3e5070-113901

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- Definition

Allocated share based compensation expense benefit.

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