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Share-Based Compensation - Summary of Share-Based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Summary of share-based compensation expense
Share-based compensation before income tax benefit	$ 4,870	$ 10,969	$ 8,038
Income tax benefit	(1,227)	(4,079)	(2,988)
Share-based compensation, net of income tax benefit	3,643	6,890	5,050
Performance Unit Incentive Plan (“PUP”)
Summary of share-based compensation expense
Share-based compensation before income tax benefit	2,260	8,088	5,703
Restricted stock
Summary of share-based compensation expense
Share-based compensation before income tax benefit	2,453	2,594	2,073
Restricted stock units
Summary of share-based compensation expense
Share-based compensation before income tax benefit	$ 157	$ 287	$ 262

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- Definition

The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

No definition available.

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- Definition

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

+ 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=109197908&loc=d3e5070-113901

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- Definition

Allocated share based compensation expense benefit.

+ References

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