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Share-based Payments - Stock Options Narrative (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2020 USD ($) shares | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) shares | Jun. 30, 2019 USD ($) shares | Dec. 31, 2019 shares | Jun. 30, 2019 $ / shares shares | Dec. 31, 2018 shares | Jun. 28, 2018 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of options outstanding (in shares) | 12,214,548 |  | 12,214,548 |  | 14,149,502 | 13,988,545 | 12,902,995 |
Share-based payments | $ | $ 2,546 | $ 2,647 | $ 4,982 | $ 4,418 |  |  |  |
Issuance of options (in shares) |  |  |  | 1,315,787 |  |  |  |
2015 Stock Option Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of options outstanding (in shares) | 10,486,569 |  | 10,486,569 |  |  |  |  |
2018 Stock Option Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of options outstanding (in shares) | 1,727,979 |  | 1,727,979 |  |  |  |  |
Issuance of options (in shares) |  |  | 0 |  |  |  |  |
2020 Omnibus Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of options outstanding (in shares) | 0 |  | 0 |  |  |  |  |
Stock options |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share-based payments | $ | $ 1,770 | $ 2,647 | $ 3,500 | $ 4,418 |  |  |  |
Stock options | 2015 Stock Option Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Future awards to be granted (in shares) |  |  |  |  |  |  |  | 0
Weighted Average | Stock options |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share price at grant date (in dollars per share) | $ / shares |  |  |  |  |  | $ 13.35 |  |

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