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v3.21.2

Share Capital - Additional Information (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | May 15, 2020 | Dec. 31, 2019
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Amounts pledged | $ 424,103 |  | $ 424,103 |  |  | $ 440,531 |  |  |
Preferred stock, authorized | 50,000,000 |  | 50,000,000 |  |  |  |  |  |
Preferred stock, par value | $ 0.001 |  | $ 0.001 |  |  |  |  |  |
Preferred stock, issued | 0 |  | 0 |  |  |  |  |  |
Class A Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Common stock, authorized | 50,000,000 |  | 50,000,000 |  |  | 50,000,000 |  |  |
Common stock, par value | $ 0.001 |  | $ 0.001 |  |  | $ 0.001 |  |  |
Common Stock, outstanding | 12,515,734 | 12,404,427 | 12,515,734 | 12,404,427 | 12,592,646 | 12,381,778 | 12,445,479 | 12,636,523 | 12,698,703
Common Stock, Shares, Issued | 12,515,734 |  | 12,515,734 |  |  | 12,381,778 |  |  |
Repurchase and cancelled stock | 108,494 | 84,290 | 108,494 | 684,838 |  |  |  |  |
Class B Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Common stock, authorized | 99,665 |  | 99,665 |  |  | 99,665 |  |  |
Common stock, par value | $ 0.001 |  | $ 0.001 |  |  | $ 0.001 |  |  |
Common Stock, outstanding | 99,665 |  | 99,665 |  |  | 99,665 |  |  |
Common Stock, Shares, Issued | 99,665 |  | 99,665 |  |  | 99,665 |  |  |
Previous Program [Member] | Class A Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased |  |  |  |  |  |  |  | 98,625 |
New Program [Member] | Class A Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Repurchase of class A common stock |  |  |  |  |  |  |  | 530,000 |
Stock Repurchase Program Percentage Of Shares Repurchase Of Outstanding Share |  |  |  |  |  |  |  | 4.20% |
Stock Repurchased and Retired During Period, Value | $ 4,700 | $ 2,000 |  | $ 14,200 |  |  |  |  |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased | 292,519 |  | 292,519 |  |  |  |  | 628,625 |
Stock Repurchased and Retired During Period, Shares | 108,494 | 84,290 |  | 684,838 |  |  |  |  |
Stock Repurchased and Retired During Period, Per Share | $ 43.46 | $ 23.28 |  | $ 20.78 |  |  |  |  |
Stock Repurchased and Retired During Period, Shares | 108,494 | 84,290 |  | 684,838 |  |  |  |  |

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