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Benefit Plans - Additional Information (Details) $ / shares in Units, $ in Thousands |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 31, 2010 $ / shares shares | Jan. 08, 2010 $ / shares shares | Dec. 31, 2008 $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 USD ($) $ / shares shares | Dec. 31, 2013 USD ($) $ / shares shares | Dec. 31, 2012 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |  |
Common share options granted (shares) |  |  |  | 0 | 0 | 0 |
Recognized compensation expense | $ |  |  |  | $ 480 | $ 1,038 | $ 1,037 |
Exercises in period, intrinsic value | $ |  |  |  |  | $ 2,780 | 8,607 |
Options, exercisable, intrinsic value | $ |  |  |  | $ 1,277 |  |  |
Vesting period (in years) |  |  |  | 5 years |  |  |
Shares held in employee trust (in shares) |  |  |  | 427,531 | 427,531 |  |
Initial vesting percentage |  |  |  | 25.00% |  |  |
Vesting percentage |  |  |  | 100.00% |  |  |
Vesting period (in years) |  |  |  | 4 years |  |  |
Cost recognized | $ |  |  |  | $ 333 | $ 299 | 298 |
Allocated share-based compensation expense | $ |  |  |  | $ 8,201 | $ 7,550 | $ 7,145 |
Options 2010 [Member] |  |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |  |
Common share options granted (shares) | 1,248,501 |  |  |  |  |  |
Common share options exercise price (usd per share) | $ / shares | $ 7.95 |  |  |  |  |  |
Expiration period after termination (in months) |  |  |  | 6 months |  |  |
Deferred compensation equity | $ |  |  |  | $ 2,422 |  |  |
Recognized compensation expense average period (in years) |  |  |  | 5 years |  |  |
Options 2010 [Member] | Share-based Compensation Award, Tranche One [Member] |  |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |  |
Vesting rate | 20.00% |  |  |  |  |  |
Options 2010 [Member] | Share-based Compensation Award, Tranche Two [Member] |  |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |  |
Vesting rate | 20.00% |  |  |  |  |  |
Options 2010 [Member] | Share-based Compensation Award, Tranche Three [Member] |  |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |  |
Vesting rate | 20.00% |  |  |  |  |  |
Options 2010 [Member] | Share-based Compensation Award, Tranche Four [Member] |  |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |  |
Vesting rate | 20.00% |  |  |  |  |  |
Options 2010 [Member] | Share-based Compensation Award, Tranche Five [Member] |  |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |  |
Vesting rate | 20.00% |  |  |  |  |  |
Options 2009 [Member] |  |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |  |
Common share options granted (shares) |  | 1,265,500 |  |  |  |  |
Common share options exercise price (usd per share) | $ / shares |  | $ 6.39 |  |  |  |  |
Expiration period after termination (in months) |  |  |  | 6 months |  |  |
Deferred compensation equity | $ |  |  |  | $ 2,771 |  |  |
Recognized compensation expense average period (in years) |  |  |  | 5 years |  |  |
Options 2009 [Member] | Share-based Compensation Award, Tranche One [Member] |  |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |  |
Vesting rate |  | 20.00% |  |  |  |  |
Options 2009 [Member] | Share-based Compensation Award, Tranche Two [Member] |  |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |  |
Vesting rate | 20.00% |  |  |  |  |  |
Options 2009 [Member] | Share-based Compensation Award, Tranche Three [Member] |  |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |  |
Vesting rate | 20.00% |  |  |  |  |  |
Options 2009 [Member] | Share-based Compensation Award, Tranche Four [Member] |  |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |  |
Vesting rate | 20.00% |  |  |  |  |  |
Options 2009 [Member] | Share-based Compensation Award, Tranche Five [Member] |  |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |  |
Vesting rate | 20.00% |  |  |  |  |  |
Options 2008 [Member] |  |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |  |
Common share options granted (shares) |  |  | 2,000,000 |  |  |  |
Common share options exercise price (usd per share) | $ / shares |  |  | $ 5.60 |  |  |  |
Number of trading period days (in days) |  |  | 20 days |  |  |  |
Options convertible to common shares |  |  | 1.13 |  |  |  |
Options converted to common shares exercise price (usd per shares) | $ / shares |  |  | $ 4.97 |  |  |  |
Deferred compensation equity | $ |  |  |  | $ 2,480 |  |  |
Recognized compensation expense average period (in years) |  |  |  | 3 years 7 months 6 days |  |  |
Options 2008 [Member] | Minimum [Member] |  |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |  |
Average closing price, lower limit (usd per share) | $ / shares |  |  | 8 |  |  |  |
Options 2008 [Member] | Maximum [Member] |  |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |  |
Average closing price, lower limit (usd per share) | $ / shares |  |  | $ 10 |  |  |  |
Options 2008 [Member] | Share Based Compensation Arrangement By Share Based Payment Award Vesting Rate First Vesting Trigger [Member] |  |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |  |
Vesting rate |  |  | 50.00% |  |  |  |
Performance Shares [Member] |  |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |  |
Measurement period (in years) |  |  |  | 3 years |  |  |
Index shares (in shares) |  |  |  | 321,018 |  |  |
Peer shares (in shares) |  |  |  | 321,011 |  |  |
Number of shares granted (in shares) |  |  |  | 170,650 |  |  |
Vesting period (in years) |  |  |  | 3 years |  |  |
Employee Stock Option [Member] |  |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |  |
Common share options exercise price (usd per share) | $ / shares |  |  |  | $ 7.05 | $ 7.05 | $ 6.95 | $ 6.44
Number of shares outstanding (in shares) |  |  |  | 1,350,410 | 1,350,410 | 1,955,701 | 3,480,080
Non-vested Shares [Member] |  |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |  |
Unrecognized compensation costs | $ |  |  |  | $ 13,707 |  |  |
Number of shares granted (in shares) |  |  |  | 812,679 |  |  |
Non-options, nonvested, number (in shares) |  |  |  | 2,369,350 | 1,970,385 | 2,521,046 |
Number of shares available for grant (in shares) |  |  |  | 3,320,961 |  |  |
Total compensation cost not yet recognized, period for recognition (in years) |  |  |  | 3 years 3 months 18 days |  |  |
Shares Subject to Time [Member] |  |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |  |
Non-options, nonvested, number (in shares) |  |  |  | 1,720,824 |  |  |
Shares Subject to Performance [Member] |  |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |  |
Non-options, nonvested, number (in shares) |  |  |  | 648,526 |  |  |

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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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