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Share Capital - Additional Information (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Jul. 26, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2017
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Amounts pledged | $ 359,151 |  | $ 359,151 |  |  |  | $ 517,951 |  |
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 | 12,698,703 | 13,177,931 | 12,698,703 | 13,177,931 | 12,756,308 | 12,756,308 | 12,941,809 | 13,156,353 | 13,139,203
Common Stock, Shares, Issued | 12,698,703 |  | 12,698,703 |  |  |  | 12,941,809 |  |
Repurchase and cancelled stock | 76,657 | 0 | 323,249 | 0 |  |  |  |  |
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 |  |  |  |  |  | 26,192 |  |  |
New Program [Member] | Class A Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Repurchase of class A common stock |  |  |  |  | 640,000 |  |  |  |
Stock Repurchase Program Percentage Of Shares Repurchase Of Outstanding Share |  |  |  |  | 5.00% |  |  |  |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased | 589,535 |  | 589,535 |  | 666,192 |  |  |  |
Repurchase and cancelled stock | 76,657 |  | 323,249 |  |  |  |  |  |
Treasury Stock, Retired, Cost Method, Amount | $ 2,000 |  | $ 8,400 |  |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share | $ 26.71 |  | $ 25.99 |  |  |  |  |  |

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