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Share-based compensation - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2015 | Jul. 15, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unamortized share compensation expense | $ 7.1 | $ 7.4 |  |  |
Unamortized share compensation expense, period of recognition | 1 year 6 months | 1 year 4 months 24 days |  |  |
Fair value assumptions |  |  |  |  |
Aggregate intrinsic value of options outstanding | $ 2.4 |  |  |  |
Aggregate intrinsic value of options exercisable | 2.4 |  |  |  |
Proceeds from stock options exercised | 1.9 | $ 0.0 |  |  |
Defined Contribution Plan, Administrative Expense | $ 0.9 | $ 0.9 | $ 0.8 |  |
Non-Employee Directors |  |  |  |  |
Fair value assumptions |  |  |  |  |
Restricted stock awards issued | 67,291 | 50,644 | 36,418 |  |
Employees |  |  |  |  |
Fair value assumptions |  |  |  |  |
Restricted stock awards issued | 336,069 | 0 | 0 |  |
Management and director options |  |  |  |  |
Fair value assumptions |  |  |  |  |
Remaining contractual life | 2 years 2 months 12 days | 3 years 2 months 12 days |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term | 2 years 2 months 12 days | 3 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 |  |  |  |
Restricted share awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period |  |  |  | 3 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) | 9,006,995 | 9,017,930 |  |  |

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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