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Employment and Compensation Arrangements - Private Placement Warrant (Details) - $ / shares | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Shareholders' Equity |  |  |  |
Beginning Balance | 52,800,000 |  |  |
Exercise of Private Placement Warrants | (212,174) | 0 |  |
Restricted Stock Units (RSUs) |  |  |  |
Shareholders' Equity |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ 23.68 |  | $ 19.30 |
Warrant [Member] |  |  |  |
Shareholders' Equity |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | 11.00 | $ 18.36 | $ 17.35 | $ 6.11
Exercised | $ 16.93 | $ 0 |  |
Private Warrant |  |  |  |
Shareholders' Equity |  |  |  |
Beginning Balance | 18,026,000 | 18,300,000 |  |
Closing Balance | 17,813,826 | 18,300,000 |  |

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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + 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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