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Pension benefits (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |
Pension Expense | $ 709 | $ 202
Defined Benefit Plan, Accumulated Benefit Obligation | 1,700 | 2,000
Defined Contribution Plan Entities Matching Contribution Amount | 100 |
Quantifying Misstatement in Current Year Financial Statements, Amount | 269 |
Subsidiaries [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension Expense | $ 700 | $ 200

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- Definition Amount of matching contribution made by the entity under defined contribution plan. + References No definition available. + Details
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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + 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 Amount of cost (reversal of cost) for pension benefits. Excludes other postretirement benefits. + References No definition available. + Details
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- Definition Amount of each individual error being corrected in the correcting adjustment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 1.N) -URI http://asc.fasb.org/extlink&oid=112272810&loc=d3e30840-122693 + Details
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