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Equity Awards and Instruments - Stock Options Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  |  |  | 9 Months Ended | 12 Months Ended
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Aug. 28, 2020 | May 19, 2019 | May 15, 2019 | May 12, 2019 | Mar. 22, 2019 | Mar. 12, 2019 | Sep. 06, 2018 | May 29, 2018 | Mar. 22, 2018 | Sep. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Put provision start period, number of months since exercise |  |  |  |  |  |  |  |  |  | 6 months |  |
Put provision end Period, number of days after start period |  |  |  |  |  |  |  |  |  | 30 days |  |
Call Provision Exercise Period |  |  |  |  |  |  |  |  |  | 7 months |  |
Dividends payable (USD per share) | $ 1.50 |  |  |  |  |  |  |  |  |  |  |
Stock options exercise price reduction (USD per share) | $ 1.50 |  |  |  |  |  |  |  |  |  |  |
Stock Option |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Put provision start period, number of months since exercise |  |  |  |  |  |  |  |  |  |  | 6 months |
Put provision end Period, number of days after start period |  |  |  |  |  |  |  |  |  |  | 30 days |
Call Provision Exercise Period |  |  |  |  |  |  |  |  |  |  | 7 months |
Granted (in shares) |  |  | 10,000 |  | 4,816,000 |  | 10,000 | 5,096,000 | 20,000 |  | 4,826,000 | 5,126,000
Grant date fair value (USD per share) |  |  | $ 1.65 |  | $ 1.66 |  | $ 1.96 | $ 1.46 | $ 1.43 |  |  |
Proceeds from stock options exercised |  |  |  |  |  |  |  |  |  |  | $ 3,612 | $ 2,179
Stock Option | 2020 Incentive Award Plan |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  |  |  |  | 10,000 |  |
Proceeds from stock options exercised |  |  |  |  |  |  |  |  |  | $ 7,776 | $ 3,612 |
Stock Option | Class B Common Stock | 2020 Incentive Award Plan |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  | 10,000 | 4,816,000 |  |  |  |  |  |  |
Grant date fair value (USD per share) |  | $ 1.65 |  |  | $ 1.66 | $ 2.49 |  |  |  |  |  |

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