Equity-Based Compensation - Summary of Equity-Based Compensation Expense (Details) $ / shares in Units, $ in Thousands	3 Months Ended
Mar. 31, 2018 USD ($) plan $ / shares shares	Mar. 31, 2017 USD ($) shares	Dec. 31, 2017 $ / shares shares
Share-based Compensation
Number of Equity-Based Compensation Plans \| plan	4
Restricted stock units	$ 923	$ 880
Allocated Share-based Compensation Expense, Net of Tax	714	549
Service-Based RSUs
Share-based Compensation
Restricted stock units	455	550
Performance and market-based RSU's
Share-based Compensation
Restricted stock units	$ 510	$ 384
Cash Settled Awards
Share-based Compensation
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number \| shares	17,361	14,082
Restricted stock expense (reversal)	$ 42	$ (54)
RSUs
Share-based Compensation
Restricted stock units	923	880
Income tax benefit	$ 209	$ 331
Officers, key employees, and non-employee directors \| Service-Based RSUs
Share-based Compensation
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Forfeitures \| shares	515
Releasable - weighted average fair value \| $ / shares	$ 12.48
Granted - shares \| shares	71,722
Forfeited - weighted average fair value \| $ / shares	$ 14.83
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Released Number \| shares	60,797
Granted - weighted average fair value \| $ / shares	$ 26.20
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value \| $ / shares	16.36		$ 14.60
Converted - weighted average fair value \| $ / shares	$ 16.43
Releasable - shares \| shares	260,478
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number \| shares	409,757		399,347

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Restricted stock expense (benefit)

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Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Releasable Weighted Average Grant Date Fair Value

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Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Released Number

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Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Releasable

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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.

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

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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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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Number of shares under non-option equity instrument agreements that were cancelled as a result of occurrence of a terminating event.

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Net number of non-option equity instruments granted to participants.

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Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

+ 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 (c)(1)(i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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-SubTopic 10
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-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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