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Equity-Based Compensation - Restricted Stock Units (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) $ / shares shares | Sep. 30, 2021 USD ($) $ / shares shares
Restricted Stock Units (RSUs) |  |
Shares |  |
Non-vested restricted stock beginning balance |  | 30,052
Granted |  | 1,027,512
Vested |  | 24,728
Forfeited |  | (48,956)
Non-vested restricted stock Ending balance | 983,880 | 983,880
Weighted Average Grant Date Fair Value |  |
Non-vested restricted stock of beginning balance (in dollars per share) | $ / shares |  | $ 23.00
Granted (in dollars per share) | $ / shares |  | 27.47
Vested (in dollars per share) | $ / shares |  | 23.00
Forfeited (in dollars per share) | $ / shares |  | 26.86
Non-vested restricted stock of ending balance (in dollars per share) | $ / shares | $ 27.48 | $ 27.48
Vested shares withheld for minimum statutory tax withholding requirements |  | 10,003
Compensation expense | $ | $ 2,362 | $ 4,898
Unrecognized share-based compensation expense | $ | 22,559 | $ 22,559
Unrecognized share-based compensation expense, recognition period |  | 29 months 9 days
Performance Based Class B Units |  |
Weighted Average Grant Date Fair Value |  |
Compensation expense | $ | 3,120 | $ 10,144
Unrecognized share-based compensation expense | $ | $ 14,072 | $ 14,072
Unrecognized share-based compensation expense, recognition period |  | 26 months
Performance Based Common Stock Units |  |
Shares |  |
Granted |  | 400,354
Forfeited |  | (11,905)
Non-vested restricted stock Ending balance | 388,449 | 388,449
Weighted Average Grant Date Fair Value |  |
Granted (in dollars per share) | $ / shares |  | $ 27.01
Forfeited (in dollars per share) | $ / shares |  | 27.45
Non-vested restricted stock of ending balance (in dollars per share) | $ / shares | $ 27.00 | $ 27.00
Compensation expense | $ | $ 1,916 | $ 3,506
Unrecognized share-based compensation expense | $ | 6,982 | $ 6,982
Unrecognized share-based compensation expense, recognition period |  | 19 months 15 days
Time Based Class B Units |  |
Weighted Average Grant Date Fair Value |  |
Vesting period |  | 5 years
Compensation expense | $ | 767 | $ 2,298
Unrecognized share-based compensation expense | $ | $ 7,230 | $ 7,230
Unrecognized share-based compensation expense, recognition period |  | 35 months 6 days

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of grants made 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). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition 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). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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 (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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