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v3.19.1

Share Capital - Additional Information (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | May 05, 2017 | Sep. 15, 2015
Class of Stock [Line Items] |  |  |  |  |  |
Amounts pledged | $ 390,832 |  | $ 517,951 |  |  |
Preferred stock, authorized | 50,000,000 |  |  |  |  |
Preferred stock, par value | $ 0.001 |  |  |  |  |
Preferred stock, issued | 0 |  |  |  |  |
Class A Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Common stock, authorized | 50,000,000 |  | 50,000,000 |  |  |
Common stock, par value | $ 0.001 |  | $ 0.001 |  |  |
Common Stock, outstanding | 12,923,517 | 13,141,103 | 12,941,809 | 13,139,203 | 13,178,571 |
Common Stock, Shares, Issued | 12,923,517 |  | 12,941,809 |  |  |
Repurchase and cancelled stock | 79,383 | 0 |  |  |  |
Class B Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Common stock, authorized | 99,665 |  | 99,665 |  |  |
Common stock, par value | $ 0.001 |  | $ 0.001 |  |  |
Common Stock, outstanding | 99,665 |  | 99,665 |  |  |
Common Stock, Shares, Issued | 99,665 |  | 99,665 |  |  |
Previous Program [Member] | Class A Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Repurchase of class A common stock |  |  |  |  |  | 665,000
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased |  |  |  |  |  | 40,734
New Program [Member] | Class A Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Treasury Stock, Retired, Amount Per Share | $ 25.64 |  |  |  |  |
Repurchase of class A common stock |  |  |  |  | 650,000 |
Stock Repurchase Program Percentage Of Shares Repurchase Of Outstanding Share |  |  |  |  | 5.00% |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased | 193,401 |  | 272,784 |  | 690,734 |
Common Stock, Shares, Issued |  |  |  |  | 13,178,571 |
Repurchase and cancelled stock | 79,383 |  |  |  |  |
Treasury Stock, Retired, Cost Method, Amount | $ 2,000 |  |  |  |  |

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