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v3.20.4

Share Capital - Additional Information (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | May 15, 2020
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amounts pledged | $ 440,531 |  |  |  | $ 357,120 |  |  |  | $ 440,531 | $ 357,120 |  |
Preferred stock, authorized | 50,000,000 |  |  |  |  |  |  |  | 50,000,000 |  |  |
Preferred stock, par value | $ 0.001 |  |  |  |  |  |  |  | $ 0.001 |  |  |
Preferred stock, issued | 0 |  |  |  |  |  |  |  | 0 |  |  |
Dividends | $ 1.12 | $ 0.12 | $ 0.12 | $ 0.12 | $ 0.12 | $ 0.12 | $ 0.11 | $ 0.11 | $ 1.48 | $ 0.46 |  |
Class A Stock |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, authorized | 50,000,000 |  |  |  | 50,000,000 |  |  |  | 50,000,000 | 50,000,000 |  |
Common stock, par value | $ 0.001 |  |  |  | $ 0.001 |  |  |  | $ 0.001 | $ 0.001 |  |
Common Stock, Shares, Issued | 12,381,778 |  |  |  | 12,698,703 |  |  |  | 12,381,778 | 12,698,703 |  |
Repurchase and cancelled stock |  |  |  |  |  |  |  |  | 718,522 | 323,249 |  |
Dividends |  |  |  |  |  |  |  |  | $ 1.48 | $ 0.46 | $ 0.44 |
Special Cash Dividend | Class A Stock |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Dividends, Cash |  |  |  |  |  |  |  |  | $ 12,500 |  |  |
Dividends |  |  |  |  |  |  |  |  | $ 1.00 |  |  |
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, Shares |  |  |  |  |  |  |  |  | 718,522 | 323,249 |  |
Stock Repurchased and Retired During Period, Value |  |  |  |  |  |  |  |  | $ 15,000 | $ 8,400 |  |
Stock Repurchased and Retired During Period, Per Share |  |  |  |  |  |  |  |  | $ 20.94 | $ 25.99 |  |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased | 401,013 |  |  |  | 589,535 |  |  |  | 401,013 | 589,535 |  | 628,625

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