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Summary of Significant Accounting Policies - Earnings Per Share (Details) - shares | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | 206,123 | 298,095 | [1] |
Restricted Shares [Member] |  |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Incremental Common Shares Attributable to Share-based Payment Arrangements | 0 | 245,828 |  | 293,021
Stock Options [Member] |  |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Incremental Common Shares Attributable to Share-based Payment Arrangements | 0 | 141,656 |  | 176,428
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | 206,123 | 251,667 |  | 342,448
[1] | Beginning balance and weighted average option price have been retrospectively adjusted to give effect to the distribution ratio as required per the anti-dilution provisions of the Plans, resulting in 46,428 additional shares.

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