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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, 2020 USD ($) shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |  |  |  |
Common share options granted (in shares) |  |  |  | 0 | 0 | 0
Exercises in period, intrinsic value | $ |  |  |  | $ 106 | $ 271 | $ 26
Shares held in employee trust (in shares) |  |  |  | 130,863 | 130,863 |
Initial vesting percentage |  |  |  | 25.00% |  |
Vesting percentage |  |  |  | 100.00% |  |
Vesting period (in years) |  |  |  | 4 years |  |
Cost recognized | $ |  |  |  | $ 393 | $ 403 | 397
Allocated share-based compensation expense | $ |  |  |  | $ 6,185 | $ 5,831 | $ 6,302
Options 2010 |  |  |  |  |  |
Share-based Payment Arrangement, Option, 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 |  |  |  |  |
Recognized compensation expense average period (in years) |  |  |  | 5 years |  |
Options 2010 | Share-based Payment Arrangement, Tranche One |  |  |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |  |  |  |
Award vesting rights, percentage | 20.00% |  |  |  |  |
Options 2010 | Share-based Payment Arrangement, Tranche Two |  |  |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |  |  |  |
Award vesting rights, percentage | 20.00% |  |  |  |  |
Options 2010 | Share-based Payment Arrangement, Tranche Three |  |  |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |  |  |  |
Award vesting rights, percentage | 20.00% |  |  |  |  |
Options 2010 | Share-based Compensation Award, Tranche Four |  |  |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |  |  |  |
Award vesting rights, percentage | 20.00% |  |  |  |  |
Options 2010 | Share-based Compensation Award, Tranche Five |  |  |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |  |  |  |
Award vesting rights, percentage | 20.00% |  |  |  |  |
Options 2009 |  |  |  |  |  |
Share-based Payment Arrangement, Option, 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 |  |  |  |
Recognized compensation expense average period (in years) |  |  |  | 5 years |  |
Options 2009 | Share-based Payment Arrangement, Tranche One |  |  |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |  |  |  |
Award vesting rights, percentage |  | 20.00% |  |  |  |
Options 2009 | Share-based Payment Arrangement, Tranche Two |  |  |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |  |  |  |
Award vesting rights, percentage |  | 20.00% |  |  |  |
Options 2009 | Share-based Payment Arrangement, Tranche Three |  |  |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |  |  |  |
Award vesting rights, percentage |  | 20.00% |  |  |  |
Options 2009 | Share-based Compensation Award, Tranche Four |  |  |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |  |  |  |
Award vesting rights, percentage |  | 20.00% |  |  |  |
Options 2009 | Share-based Compensation Award, Tranche Five |  |  |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |  |  |  |
Award vesting rights, percentage |  | 20.00% |  |  |  |
Options 2008 |  |  |  |  |  |
Share-based Payment Arrangement, Option, 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 |  |  |
Recognized compensation expense average period (in years) |  |  |  | 3 years 7 months 6 days |  |
Options 2008 | Minimum |  |  |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |  |  |  |
Average closing price, lower limit (usd per share) | $ / shares |  |  | 8.00 |  |  |
Options 2008 | Maximum |  |  |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |  |  |  |
Average closing price, lower limit (usd per share) | $ / shares |  |  | $ 10.00 |  |  |
Options 2008 | Share Based Compensation Arrangement By Share Based Payment Award Vesting Rate First Vesting Trigger |  |  |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |  |  |  |
Award vesting rights, percentage |  |  | 50.00% |  |  |
Non-Management Award Grant |  |  |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |  |  |  |
Shares issued for services (in shares) |  |  |  | 47,130 | 67,226 | 66,318
Shares issued for services, value | $ |  |  |  | $ 500 | $ 595 | $ 599
Non-vested Shares |  |  |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |  |  |  |
Shares issued for services (in shares) |  |  |  | 243,270 | 277,460 |
Shares issued for services, value | $ |  |  |  | $ 2,581 | $ 2,270 |
Non-options, nonvested, number (in shares) |  |  |  | 2,704,729 | 2,941,412 | 3,455,077
Number of shares available for grant (in shares) |  |  |  | 2,359,683 |  |
Compensation cost not yet recognized | $ |  |  |  | $ 6,122 |  |
Total compensation cost not yet recognized, period for recognition (in years) |  |  |  | 1 year 7 months 6 days |  |
Shares Subject to Time |  |  |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |  |  |  |
Non-options, nonvested, number (in shares) |  |  |  | 1,024,584 |  |
Shares Subject to Performance |  |  |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |  |  |  |
Non-options, nonvested, number (in shares) |  |  |  | 1,680,145 |  |

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