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Share-based compensation - Narrative (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jul. 15, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unamortized share compensation expense | $ 14,200,000 | $ 7,100,000 |  |
Unamortized share compensation expense, period of recognition | 1 year 10 months 24 days | 1 year 6 months |  |
Share price (in dollars per share) | $ 10.00 |  |  |
Aggregate intrinsic value of options outstanding | $ 0 | $ 2,400,000 |  |
Aggregate intrinsic value of options exercisable | 0 | 2,400,000 |  |
Proceeds from stock options exercised |  | 1,900,000 |  |
Defined Contribution Plan, Administrative Expense | $ 1,000,000.0 | $ 900,000 | $ 900,000 |
Management |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Restricted stock awards issued | 364,520 |  |  |
Non-Employee Directors |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Restricted stock awards issued | 559,017 | 67,291 | 50,644 |
Employees |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Restricted stock awards issued | 105,836 | 336,069 | 0 |
Management and director options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Remaining contractual life | 1 year 2 months 12 days | 2 years 2 months 12 days |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term | 1 year 2 months 12 days | 2 years 2 months 12 days |  |
Management and director options | Management |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Service condition met on each of first five anniversary dates following grant date | 20.00% |  |  |
Award vesting period | 5 years |  |  |
Omnibus plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares authorized (in shares) |  |  |  | 21,627,906
Number of shares available for future issuance (in shares) | 7,617,210 | 9,006,995 |  |

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