Equity-Based Compensation - Summary of Equity-Based Compensation Expense (Details 2) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Equity-Based Compensation
Restricted stock units	$ 4,184	$ 2,738	$ 3,195
CTS Cash Settled Awards [Member]
Equity-Based Compensation
Restricted stock units	72	76	16
Service-Based RSUs
Equity-Based Compensation
Restricted stock units	1,762	1,997	1,944
Performance-Based RSUs
Equity-Based Compensation
Restricted stock units	2,350	665	1,235
RSUs
Equity-Based Compensation
Restricted stock units	4,184	2,738	3,195
Income tax benefit	1,573	1,029	1,201
Allocated Share-based Compensation Expense, Net of Tax	$ 2,611	$ 1,709	$ 1,994

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.

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ 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=96867065&loc=d3e5070-113901

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- Definition

The noncash expense that represents the cost of restricted stock or unit distributed to employees as compensation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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