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Share-based payment (Schedule of Share-based Payment) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 USD ($) item | Dec. 31, 2021 USD ($) item | Dec. 31, 2020 USD ($)
Disclosure Of Share-based Payment [Line Items] |  |  |
Number of share options outstanding in share-based payment arrangement | 584,395 |  |
Number of share options granted in share-based payment arrangement | 1,096,685 |  |
Number of share options forfeited in share-based payment arrangement | (8,146) |  |
Number of share options exercised in share-based payment arrangement | (127,694) |  |
Number of share options outstanding in share-based payment arrangement | 1,545,240 | 584,395 |
Expense from share-based payment transactions with employees | $ | $ 11,038 | $ 6,621 | $ 8,444
Shares granted to Non-Executive Directors |  |  |
Disclosure Of Share-based Payment [Line Items] |  |  |
Number of share options outstanding in share-based payment arrangement | 0 |  |
Number of share options granted in share-based payment arrangement | 75,636 |  |
Number of share options forfeited in share-based payment arrangement | 0 |  |
Number of share options exercised in share-based payment arrangement | (75,636) |  |
Number of share options outstanding in share-based payment arrangement | 0 | 0 |
Expense from share-based payment transactions with employees | $ | $ 1,041 | $ 861 | 665
Shares granted to Executive Directors |  |  |
Disclosure Of Share-based Payment [Line Items] |  |  |
Number of share options outstanding in share-based payment arrangement | 170,330 |  |
Number of share options granted in share-based payment arrangement | 257,665 |  |
Number of share options forfeited in share-based payment arrangement | 0 |  |
Number of share options exercised in share-based payment arrangement | (52,058) |  |
Number of share options outstanding in share-based payment arrangement | 375,937 | 170,330 |
Expense from share-based payment transactions with employees | $ | $ 3,560 | $ 800 | 800
VCP |  |  |
Disclosure Of Share-based Payment [Line Items] |  |  |
Number of share options outstanding in share-based payment arrangement | 0 |  |
Number of share options granted in share-based payment arrangement | 0 |  |
Number of share options forfeited in share-based payment arrangement | 0 |  |
Number of share options exercised in share-based payment arrangement | 0 |  |
Number of share options outstanding in share-based payment arrangement | 0 | 0 |
Expense from share-based payment transactions with employees | $ | $ 2,016 | $ 4,098 | 5,705
LTIP for executives |  |  |
Disclosure Of Share-based Payment [Line Items] |  |  |
Number of share options outstanding in share-based payment arrangement | 0 |  |
Number of share options granted in share-based payment arrangement | 571,984 |  |
Number of share options forfeited in share-based payment arrangement | 0 |  |
Number of share options exercised in share-based payment arrangement | 0 |  |
Number of share options outstanding in share-based payment arrangement | 571,984 | 0 |
Expense from share-based payment transactions with employees | $ | $ 2,111 | $ 0 | 0
Year Of Issuance 2022 [Member] |  |  |
Disclosure Of Share-based Payment [Line Items] |  |  |
Number of share options outstanding in share-based payment arrangement | 0 |  |
Number of share options granted in share-based payment arrangement | 191,400 |  |
Number of share options forfeited in share-based payment arrangement | 0 |  |
Number of share options exercised in share-based payment arrangement | 0 |  |
Number of share options outstanding in share-based payment arrangement | 191,400 | 0 |
Expense from share-based payment transactions with employees | $ | $ 619 | $ 0 | 0
Year of issuance 2020 [Member] |  |  |
Disclosure Of Share-based Payment [Line Items] |  |  |
Number of share options outstanding in share-based payment arrangement | 414,065 |  |
Number of share options granted in share-based payment arrangement | 0 |  |
Number of share options forfeited in share-based payment arrangement | (8,146) |  |
Number of share options exercised in share-based payment arrangement | 0 |  |
Number of share options outstanding in share-based payment arrangement | 405,919 | 414,065 |
Expense from share-based payment transactions with employees | $ | $ 1,691 | $ 862 | 1,274
Issuance [Member] |  |  |
Disclosure Of Share-based Payment [Line Items] |  |  |
Number of share options outstanding in share-based payment arrangement | 414,065 |  |
Number of share options granted in share-based payment arrangement | 191,400 |  |
Number of share options forfeited in share-based payment arrangement | (8,146) |  |
Number of share options exercised in share-based payment arrangement | 0 |  |
Number of share options outstanding in share-based payment arrangement | 597,319 | 414,065 |
Expense from share-based payment transactions with employees | $ | $ 2,310 | $ 862 | $ 1,274

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