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Equity Awards and Instruments - Stock Options Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Aug. 28, 2020 | Mar. 12, 2020 | May 19, 2019 | Mar. 22, 2019 | Sep. 30, 2020 | Dec. 31, 2019
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 | 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 | 10,000 | 4,816,000 |  |
Grant date fair value (USD per share) |  | $ 2.49 | $ 1.65 | $ 1.66 |  |

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