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Stock-based Compensation - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Employee stock compensation | $ 5,840 | $ 4,791 | $ 15,718 | $ 14,409
Existing and newly elected board member |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Award vesting period (in years) |  |  | 3 years |
Employees |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Award vesting period (in years) |  |  | 3 years |
OPP plan | Tranche one |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Award vesting period (in years) |  |  | 3 years |
Award vesting percentage after initial performance period |  |  | 50.00% |
OPP plan | Tranche two |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Award vesting period (in years) |  |  | 3 years |
Award vesting rights |  |  | 50.00% |
Award mandatory holding period (in years) |  |  | 2 years |
PSU plan 2020 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Post vesting period (in years) |  |  | 2 years |
PSU plan 2020 | Tranche one |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Award performance period (in years) |  |  | 3 years |
PSU plan 2020 | Tranche two |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Award vesting period (in years) |  |  | 3 years |
Award performance period (in years) |  |  | 1 year |

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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=120381028&loc=d3e5070-113901 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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