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Business segment information (Details 1) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of Reporting Segment [Line Items] |  |  |
profit for the year | $ 63,593 | $ 86,053 | $ 11,138
Impairment loss on non-financial assets | (296) | (500) | 5,967
Assets | 6,288,898 | 7,249,666 | 7,609,185
Other assets - unallocated | 6,816 | 8,857 |
Liabilities | 5,250,978 | 6,233,499 | 6,615,595
Other liabilities - unallocated | 18,714 | 17,149 |
Reportable segments [member] |  |  |
Disclosure of Reporting Segment [Line Items] |  |  |
profit for the year | 63,593 | 86,053 | 15,189
Assets | 6,282,090 | 7,240,835 | 7,592,492
Liabilities | 5,232,264 | 6,216,350 | 6,601,980
Unallocated amounts [member] |  |  |
Disclosure of Reporting Segment [Line Items] |  |  |
Impairment loss on non-financial assets | 0 | 0 | (4,051)
Other assets - unallocated | 6,808 | 8,831 | 16,693
Other liabilities - unallocated | $ 18,714 | $ 17,149 | $ 13,615

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