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Other non-current assets (Narrative) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($)
Loans receivable | $ 4,870
Financing Receivable [Member] |
Loans receivable | $ 5,797
Financing Receivable [Member] | Minimum [Member] |
Term of financing lending arrangement | 2 years
Financing Receivable [Member] | Maximum [Member] |
Term of financing lending arrangement | 4 years
Financing Receivable [Member] | Other Current Assets [Member] |
Loans receivable | $ 927
Cura Classis Entities [Member] |
Percentage of ownership interest | 48.00%

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