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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, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |
Common share options granted (in shares) |  |  |  | 0 | 0 | 0
Exercises in period, intrinsic value | $ |  |  |  | $ 1,064 | $ 2,856 |
Options, exercisable, intrinsic value | $ |  |  |  | $ 305 |  |
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 | $ |  |  |  | $ 439 | $ 357 | $ 333
Allocated share-based compensation expense | $ |  |  |  | $ 8,333 | $ 8,415 | $ 8,201
Options 2010 [Member] |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |
Common share options granted (in 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] |  |  |  |  |  |
Award vesting rights, percentage | 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] |  |  |  |  |  |
Award vesting rights, percentage | 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] |  |  |  |  |  |
Award vesting rights, percentage | 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] |  |  |  |  |  |
Award vesting rights, percentage | 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] |  |  |  |  |  |
Award vesting rights, percentage | 20.00% |  |  |  |  |
Options 2009 [Member] |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |
Common share options granted (in 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] |  |  |  |  |  |
Award vesting rights, percentage |  | 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] |  |  |  |  |  |
Award vesting rights, percentage | 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] |  |  |  |  |  |
Award vesting rights, percentage | 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] |  |  |  |  |  |
Award vesting rights, percentage | 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] |  |  |  |  |  |
Award vesting rights, percentage | 20.00% |  |  |  |  |
Options 2008 [Member] |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |
Common share options granted (in 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 share) | $ / 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] |  |  |  |  |  |
Award vesting rights, percentage |  |  | 50.00% |  |  |
Non-Management Award Grant [Member] |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |
Shares issued for services (in shares) |  |  |  | 57,334 | 50,816 | 48,051
Shares issued for services, value | $ |  |  |  | $ 596 | $ 427 | $ 468
Non-vested Shares [Member] |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |
Shares issued for services (in shares) |  |  |  | 237,560 | 225,090 |
Non-options, nonvested, number (in shares) |  |  |  | 3,767,298 | 3,151,310 | 2,369,350
Shares issued for services, value | $ |  |  |  | $ 2,551 | $ 1,724 |
Number of shares available for grant (in shares) |  |  |  | 4,978,802 |  |
Compensation cost not yet recognized | $ |  |  |  | $ 8,707 |  |
Total compensation cost not yet recognized, period for recognition (in years) |  |  |  | 2 years 6 months |  |
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) |  |  |  | 1,769,503 |  |
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) |  |  |  | 1,997,795 |  |

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