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v3.20.2

Share Capital - Additional Information (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Jun. 30, 2020 | May 15, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2018
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Amounts pledged | $ 486,165 |  | $ 486,165 |  |  |  | $ 357,120 |  |
Preferred stock, authorized | 50,000,000 |  | 50,000,000 |  |  |  |  |  |
Preferred stock, par value | $ 0.001 |  | $ 0.001 |  |  |  |  |  |
Preferred stock, issued | 0 |  | 0 |  |  |  |  |  |
Stock Repurchased and Retired During Period, Value | $ 2,000 |  | $ 14,200 |  |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share | $ 23.28 |  | $ 20.78 |  |  |  |  |  |
Stock Repurchased and Retired During Period, Shares | 84,290 |  | 684,838 |  |  |  |  |  |
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 | 12,404,427 | 12,698,703 | 12,404,427 | 12,698,703 | 12,445,479 | 12,636,523 | 12,698,703 | 12,756,308 | 12,941,809
Common Stock, Shares, Issued | 12,404,427 |  | 12,404,427 |  |  |  | 12,698,703 |  |
Repurchase and cancelled stock | 84,290 | 76,657 | 684,838 | 323,249 |  |  |  |  |
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 Repurchase Program, Remaining Number of Shares Authorized to be Repurchased | 434,697 |  | 434,697 |  |  | 628,625 |  |  |

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