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Equity-Based Compensation - Summary of Equity-Based Compensation Expense (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) plan $ / shares shares | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) plan $ / shares shares | Jun. 30, 2017 USD ($) | Dec. 31, 2017 $ / shares shares
Share-based Compensation |  |  |  |  |
Number of Equity-Based Compensation Plans | plan | 5 |  | 5 |  |
Restricted stock units |  |  | $ 2,186 | $ 1,687 |
Allocated Share-based Compensation Expense, Net of Tax | $ 978 | $ 504 | 1,692 | 1,053 |
Service-Based RSUs |  |  |  |  |
Share-based Compensation |  |  |  |  |
Restricted stock units | 563 | 465 | 1,018 | 1,015 |
Performance and market-based RSU's |  |  |  |  |
Share-based Compensation |  |  |  |  |
Restricted stock units | $ 643 | 297 | $ 1,153 |  |
Restricted stock expense (reversal) |  |  |  | (680) |
Cash Settled Awards |  |  |  |  |
Share-based Compensation |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number | shares | 17,248 |  | 17,248 |  | 14,082
Restricted stock expense (reversal) | $ (57) | (46) | $ (15) | (8) |
RSUs |  |  |  |  |
Share-based Compensation |  |  |  |  |
Restricted stock units | 1,263 | 808 | 2,186 | 1,687 |
Income tax benefit | $ 285 | $ 304 | $ 494 | $ 634 |
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 |  |  | 1,938 |  |
Releasable - weighted average fair value | $ / shares | $ 12.82 |  | $ 12.82 |  |
Granted - shares | shares |  |  | 74,222 |  |
Forfeited - weighted average fair value | $ / shares |  |  | $ 20.86 |  |
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Released Number | shares |  |  | 130,301 |  |
Granted - weighted average fair value | $ / shares |  |  | $ 26.31 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ / shares | $ 17.26 |  | 17.26 |  | $ 14.60
Converted - weighted average fair value | $ / shares |  |  | $ 14.22 |  |
Releasable - shares | shares | 194,674 |  | 194,674 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number | shares | 341,330 |  | 341,330 |  | 399,347

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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. + Details
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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 + Details
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- Definition 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. + 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)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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. + 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)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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