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Share-Based Compensation - Summary of Share-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Summary of share-based compensation expense
Share-based compensation before income tax benefit	$ 2,748	$ 1,433	$ 4,747	$ 2,499
Income tax benefit	(1,028)	(540)	(1,772)	(938)
Share-based compensation, net of income tax benefit	1,720	893	2,975	1,561
Performance unit incentive plan (“PUP”)
Summary of share-based compensation expense
Share-based compensation before income tax benefit	1,927	816	3,243	1,351
Restricted stock
Summary of share-based compensation expense
Share-based compensation before income tax benefit	774	576	1,397	1,074
Restricted stock units
Summary of share-based compensation expense
Share-based compensation before income tax benefit	$ 47	$ 41	$ 107	$ 74

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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://www.xbrl.org/2003/role/presentationRef
-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=6415400&loc=d3e5070-113901

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- Definition

Allocated share based compensation expense benefit.

+ References

No definition available.

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