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Stock plans - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Shares or units awarded | 2,548 | 2,362 |  |
Unrecognized compensation expense | $ 92 | $ 32 |  |
2008 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Share based compensation expense |  | 156 | $ 71 |
2017 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Common stock available for grant as awards | 86,994 |  |  |
Share based compensation expense | $ 272 | $ 21 |  |
Non-Performance-based restricted stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Shares or units vesting period |  | 3 years |  |
Non-Performance-based restricted stock | 2008 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Shares or units awarded |  | 2,362 |  |
Vested shares | 2,493 |  |  |
Non-Performance-based restricted stock | 2017 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Shares or units awarded | 2,548 |  |  |
Vested shares | 114 |  |  |
Performance-based restricted stock units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Shares or units vesting period |  | 3 years |  |
Cumulative diluted earnings per share period used for conditions for vesting of performance-based restricted stock units |  | 3 years |  |
Average return on equity period used for conditions for vesting of performance-based restricted stock units |  | 3 years |  |
Performance-based restricted stock units | 2008 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Number of nonvested restricted stock awards |  | 8,266 |  |
Performance-based restricted stock units | 2017 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Number of nonvested restricted stock awards | 8,920 |  |  |
Restricted Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Vested shares | 2,607 | 10,542 | 1,947 |
Number of nonvested restricted stock awards | 21,309 | 12,448 | 12,362 | 14,309
Shares or units cliff vesting period |  | 5 years |  |
Unrecognized compensation expense | $ 525 |  |  |
Weighted average vesting period | 1 year 8 months 12 days |  |  |
Stock appreciation rights granted | 11,468 | 10,628 |  |
Restricted Stock | 2008 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Vested shares |  | 10,542 |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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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 Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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 (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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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://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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