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Share Capital - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended | 39 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014 | Sep. 15, 2015 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2013 | Oct. 07, 2011
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, authorized (in shares) | 50,000,000 |  | 50,000,000 |  |  |  |  |  |  |
Preferred stock, par value (dollars per share) | $ 0.001 |  | $ 0.001 |  |  |  |  |  |  |
Preferred stock, issued (in shares) | 0 |  | 0 |  |  |  |  |  |  |
Class A Stock [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) | 50,000,000 |  | 50,000,000 |  | 50,000,000 |  |  |  |  |
Common stock, par value (dollars per share) | $ 0.001 |  | $ 0.001 |  | $ 0.001 |  |  |  |  |
Common stock, shares issued (in shares) | 13,333,368 |  | 13,333,368 |  | 13,530,688 |  |  |  |  |
Common stock, shares outstanding (in shares) | 13,333,368 | 13,530,688 | 13,333,368 | 13,530,688 | 13,530,688 | 13,348,369 | 13,650,149 | 13,519,126 | 13,377,967 |
Repurchased and canceled pursuant to the stock buy-back (in shares) | 328,844 | 0 | 328,844 | 0 |  |  |  |  |  |
Class A Stock [Member] | New Program [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, shares issued (in shares) |  |  |  |  |  | 13,348,369 |  |  |  |
Number of shares authorized to be repurchased (in shares) |  |  |  |  |  | 665,000 |  |  |  |
Percentage of repurchase of class A common stock |  |  |  |  |  | 5.00% |  |  |  |
Remaining number of shares authorized to be repurchased (in shares) | 665,000 |  | 665,000 |  |  |  |  |  |  |
Class A Stock [Member] | Previous Program [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares authorized to be repurchased (in shares) |  |  |  |  |  |  |  |  |  | 675,000
Repurchased and canceled pursuant to the stock buy-back (in shares) |  |  | 328,844 |  | 322,177 |  |  |  |  |
Stock repurchased and retired during period, value |  |  | $ 6.6 |  |  |  |  |  |  |
Stock repurchased and retired during period (dollars per share) |  |  | $ 20.12 |  |  |  |  |  |  |
Remaining number of shares authorized to be repurchased (in shares) | 23,979 |  | 23,979 |  |  |  |  |  |  |
Class B Stock [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) | 99,680 |  | 99,680 |  | 99,680 |  |  |  |  |
Common stock, par value (dollars per share) | $ 0.001 |  | $ 0.001 |  | $ 0.001 |  |  |  |  |
Common stock, shares issued (in shares) | 99,680 |  | 99,680 |  | 99,680 |  |  |  |  |
Common stock, shares outstanding (in shares) | 99,680 |  | 99,680 |  | 99,680 |  |  |  |  |

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