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v3.6.0.2

Share Capital - Additional Information (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended | 39 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2014 | Sep. 15, 2015 | Oct. 07, 2011
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts pledged | $ 438,385 |  |  |  | $ 546,334 |  |  |  | $ 438,385 | $ 546,334 |  |  |  |
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 |  |  |  |
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, outstanding | 13,261,095 |  |  |  | 13,238,486 |  |  |  | 13,261,095 | 13,238,486 | 13,530,688 | 13,530,688 | 13,348,369 |
Common Stock, Shares, Issued | 13,261,095 |  |  |  | 13,238,486 |  |  |  | 13,261,095 | 13,238,486 |  |  |  |
Repurchase and cancelled stock |  |  |  |  |  |  |  |  | 260,862 | 423,726 |  |  |  |
Dividends per share |  |  |  |  |  |  |  |  | $ 0.44 | $ 0.44 | $ 0.44 |  |  |
Class B Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, authorized | 99,665 |  |  |  | 99,680 |  |  |  | 99,665 | 99,680 |  |  |  |
Common stock, par value | $ 0.001 |  |  |  | $ 0.001 |  |  |  | $ 0.001 | $ 0.001 |  |  |  |
Common Stock, outstanding | 99,665 |  |  |  | 99,680 |  |  |  | 99,665 | 99,680 |  |  |  |
Common Stock, Shares, Issued | 99,665 |  |  |  | 99,680 |  |  |  | 99,665 | 99,680 |  |  |  |
Dividends per share |  |  |  |  |  |  |  |  | $ 0.44 | $ 0.44 | $ 0.44 |  |  |
Previous Program [Member] | Class A Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of class A common stock |  |  |  |  |  |  |  |  |  |  |  |  |  | 675,000
Stock Repurchased and Retired During Period, Shares |  |  |  |  |  |  |  |  |  | 328,844 |  | 322,177 |  |
Stock Repurchased and Retired During Period, Value |  |  |  |  |  |  |  |  |  | $ 6,600 |  |  |  |
Stock Repurchased and Retired During Period, Per Share |  |  |  |  |  |  |  |  |  | $ 20.12 |  |  |  |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased |  |  |  |  | 23,979 |  |  |  |  | 23,979 |  |  |  |
New Program [Member] | Class A Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of class A common stock |  |  |  |  |  |  |  |  |  |  |  |  | 665,000 |
Stock Repurchase Program Percentage Of Shares Repurchase Of Outstanding Share |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% |
Stock Repurchased and Retired During Period, Shares |  |  |  |  |  |  |  |  | 260,862 |  |  |  |  |
Stock Repurchased and Retired During Period, Value |  |  |  |  |  |  |  |  | $ 3,900 |  |  |  |  |
Stock Repurchased and Retired During Period, Per Share |  |  |  |  |  |  |  |  | $ 15.09 |  |  |  |  |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased | 309,256 |  |  |  |  |  |  |  | 309,256 |  |  |  |  |
Common Stock, Shares, Issued |  |  |  |  |  |  |  |  |  |  |  |  | 13,348,369 |

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