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v3.10.0.1

Share Capital - Additional Information (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | May 05, 2017 | Sep. 15, 2015
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts pledged | $ 518.0 |  |  |  | $ 655.7 |  |  |  | $ 518.0 | $ 655.7 |  |  |
Preferred stock, authorized | 50,000,000 |  |  |  |  |  |  |  | 50,000,000 |  |  |  |
Preferred stock, par value | $ 0.001 |  |  |  |  |  |  |  | $ 0.001 |  |  |  |
Preferred stock, issued | 0 |  |  |  |  |  |  |  | 0 |  |  |  |
Dividends per share | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.44 | $ 0.44 | $ 440.00 |  |
Common Class A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
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, outstanding | 12,941,809 |  |  |  | 13,139,203 |  |  |  | 12,941,809 | 13,139,203 | 13,261,095 |  | 13,348,369
Common Stock, Shares, Issued | 12,941,809 |  |  |  | 13,139,203 |  |  |  | 12,941,809 | 13,139,203 |  |  |
Repurchase and cancelled stock |  |  |  |  |  |  |  |  | 236,122 | 450,350 |  |  |
Dividends per share |  |  |  |  |  |  |  |  | $ 0.44 | $ 0.44 | $ 0.44 |  |
Class B Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, authorized | 99,665 |  |  |  | 99,665 |  |  |  | 99,665 | 99,665 |  |  |
Common stock, par value | $ 0.001 |  |  |  | $ 0.001 |  |  |  | $ 0.001 | $ 0.001 |  |  |
Common Stock, outstanding | 99,665 |  |  |  | 99,665 |  |  |  | 99,665 | 99,665 |  |  |
Common Stock, Shares, Issued | 99,665 |  |  |  | 99,665 |  |  |  | 99,665 | 99,665 |  |  |
Dividends per share |  |  |  |  |  |  |  |  | $ 0.44 | $ 0.44 | $ 0.44 |  |
Previous Program [Member] | Common Class A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  | 40,734 |  |  |  |
New Program [Member] | Common Class A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of class A common stock |  |  |  |  |  |  |  |  |  |  |  | 650,000 |
Stock Repurchase Program Percentage Of Shares Repurchase Of Outstanding Share |  |  |  |  |  |  |  |  |  |  |  | 5.00% |
Stock Repurchased and Retired During Period, Shares |  |  |  |  |  |  |  |  | 236,122 |  |  |  |
Stock Repurchased and Retired During Period, Value |  |  |  |  |  |  |  |  | $ 5.9 |  |  |  |
Stock Repurchased and Retired During Period, Per Share |  |  |  |  |  |  |  |  | $ 24.96 |  |  |  |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased | 272,784 |  |  |  |  |  |  |  | 272,784 |  |  | 690,734 |
Common Stock, Shares, Issued |  |  |  |  |  |  |  |  |  |  |  | 13,178,571 |

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