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Commitments and contingencies - Additional Information (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Loss Contingencies [Line Items] |  |
Capital Commitments | $ 1,400 | $ 0
Auction Rate Securities Committed To Purchase related to settlements with regulators | 3,500 |
Auction Rate Securities Committed To Purchase as a Result of Legal Settlements and Awards | 3,700 |
Minimum [Member] |  |
Loss Contingencies [Line Items] |  |
Maximum estimated range of aggregate loss for legal proceedings | 0 |
Maximum [Member] |  |
Loss Contingencies [Line Items] |  |
Maximum estimated range of aggregate loss for legal proceedings | $ 3,000 |
Maximum [Member] | Auction rate securities |  |
Loss Contingencies [Line Items] |  |
Securities Committed To Purchase Period | 2020 |

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- Definition Auction Rate Securities Committed To Purchase as a Result of Legal Settlements and Awards + References No definition available. + Details
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- Definition Auction Rate Securities Committed To Purchase related to settlements with regulators + References No definition available. + Details
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- Definition The amount of unfunded capital for which the entity is obligated, to those certain investments for which net asset value per share is calculated. + References No definition available. + Details
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- Definition Securities committed to purchase period. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The difference between the maximum amount of estimated loss and the amount recorded as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 05 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=99385795&loc=d3e12631-108344 + Details
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- Details
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- Details
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- Details
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