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Financial instruments - Fair values and risk management - Carrying amounts and fair values (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Hedging instruments | Forward exchange contracts used for hedging    
Disclosure of financial assets and liabilities [Line Items]    
Financial assets $ 1,500 $ 300
Measured at fair value    
Disclosure of financial assets and liabilities [Line Items]    
Financial assets 2,801 33,961
Financial liabilities 146 404
Measured at fair value | Interest rate swaps    
Disclosure of financial assets and liabilities [Line Items]    
Financial liabilities 146 404
Financial liabilities, at fair value 146 404
Measured at fair value | Interest rate swaps | Level 1    
Disclosure of financial assets and liabilities [Line Items]    
Financial liabilities, at fair value 0 0
Measured at fair value | Interest rate swaps | Level 2    
Disclosure of financial assets and liabilities [Line Items]    
Financial liabilities, at fair value 146 404
Measured at fair value | Interest rate swaps | Level 3    
Disclosure of financial assets and liabilities [Line Items]    
Financial liabilities, at fair value 0 0
Measured at fair value | Forward exchange contracts used for hedging    
Disclosure of financial assets and liabilities [Line Items]    
Financial assets 1,515 1,309
Financial assets, at fair value 1,515 1,309
Measured at fair value | Forward exchange contracts used for hedging | Level 1    
Disclosure of financial assets and liabilities [Line Items]    
Financial assets, at fair value 0 0
Measured at fair value | Forward exchange contracts used for hedging | Level 2    
Disclosure of financial assets and liabilities [Line Items]    
Financial assets, at fair value 1,515 1,309
Measured at fair value | Forward exchange contracts used for hedging | Level 3    
Disclosure of financial assets and liabilities [Line Items]    
Financial assets, at fair value 0 0
Measured at fair value | Interest rate swaps    
Disclosure of financial assets and liabilities [Line Items]    
Financial assets 1,286 32,652
Financial assets, at fair value 1,286 32,652
Measured at fair value | Interest rate swaps | Level 1    
Disclosure of financial assets and liabilities [Line Items]    
Financial assets, at fair value 0 0
Measured at fair value | Interest rate swaps | Level 2    
Disclosure of financial assets and liabilities [Line Items]    
Financial assets, at fair value 1,286 32,652
Measured at fair value | Interest rate swaps | Level 3    
Disclosure of financial assets and liabilities [Line Items]    
Financial assets, at fair value 0 0
Measured at fair value | Hedging instruments    
Disclosure of financial assets and liabilities [Line Items]    
Financial liabilities 146 404
Measured at fair value | Hedging instruments | Interest rate swaps    
Disclosure of financial assets and liabilities [Line Items]    
Financial liabilities 146 404
Measured at fair value | Hedging instruments    
Disclosure of financial assets and liabilities [Line Items]    
Financial assets 2,801 33,961
Measured at fair value | Hedging instruments | Forward exchange contracts used for hedging    
Disclosure of financial assets and liabilities [Line Items]    
Financial assets 1,515 1,309
Measured at fair value | Hedging instruments | Interest rate swaps    
Disclosure of financial assets and liabilities [Line Items]    
Financial assets 1,286 32,652
Measured at fair value | Financial assets at amortised cost    
Disclosure of financial assets and liabilities [Line Items]    
Financial assets 0  
Not measured at fair value    
Disclosure of financial assets and liabilities [Line Items]    
Financial assets 713,624 522,255
Financial liabilities 1,037,326 1,769,159
Not measured at fair value | Secured bank loans    
Disclosure of financial assets and liabilities [Line Items]    
Financial liabilities 528,359 1,333,184
Financial liabilities, at fair value 540,096 1,356,270
Not measured at fair value | Secured bank loans | Level 1    
Disclosure of financial assets and liabilities [Line Items]    
Financial liabilities, at fair value 0 0
Not measured at fair value | Secured bank loans | Level 2    
Disclosure of financial assets and liabilities [Line Items]    
Financial liabilities, at fair value 540,096 1,356,270
Not measured at fair value | Secured bank loans | Level 3    
Disclosure of financial assets and liabilities [Line Items]    
Financial liabilities, at fair value 0 0
Not measured at fair value | Unsecured other notes    
Disclosure of financial assets and liabilities [Line Items]    
Financial liabilities 201,952 197,556
Financial liabilities, at fair value 196,563 194,480
Not measured at fair value | Unsecured other notes | Level 1    
Disclosure of financial assets and liabilities [Line Items]    
Financial liabilities, at fair value 196,563 194,480
Not measured at fair value | Unsecured other notes | Level 2    
Disclosure of financial assets and liabilities [Line Items]    
Financial liabilities, at fair value 0 0
Not measured at fair value | Unsecured other notes | Level 3    
Disclosure of financial assets and liabilities [Line Items]    
Financial liabilities, at fair value 0 0
Not measured at fair value | Other borrowings    
Disclosure of financial assets and liabilities [Line Items]    
Financial liabilities 163,546 136,862
Financial liabilities, at fair value 164,261 136,862
Not measured at fair value | Other borrowings | Level 1    
Disclosure of financial assets and liabilities [Line Items]    
Financial liabilities, at fair value 0 0
Not measured at fair value | Other borrowings | Level 2    
Disclosure of financial assets and liabilities [Line Items]    
Financial liabilities, at fair value 164,261 136,862
Not measured at fair value | Other borrowings | Level 3    
Disclosure of financial assets and liabilities [Line Items]    
Financial liabilities, at fair value 0 0
Not measured at fair value | Lease liabilities    
Disclosure of financial assets and liabilities [Line Items]    
Financial liabilities 36,856 28,679
Financial liabilities, at fair value 33,359 26,778
Not measured at fair value | Lease liabilities | Level 1    
Disclosure of financial assets and liabilities [Line Items]    
Financial liabilities, at fair value 0 0
Not measured at fair value | Lease liabilities | Level 2    
Disclosure of financial assets and liabilities [Line Items]    
Financial liabilities, at fair value 33,359 26,778
Not measured at fair value | Lease liabilities | Level 3    
Disclosure of financial assets and liabilities [Line Items]    
Financial liabilities, at fair value 0 0
Not measured at fair value | Trade and other payables    
Disclosure of financial assets and liabilities [Line Items]    
Financial liabilities 106,613 72,878
Financial liabilities, at fair value 0 0
Not measured at fair value | Trade and other payables | Level 1    
Disclosure of financial assets and liabilities [Line Items]    
Financial liabilities, at fair value 0 0
Not measured at fair value | Trade and other payables | Level 2    
Disclosure of financial assets and liabilities [Line Items]    
Financial liabilities, at fair value 0 0
Not measured at fair value | Trade and other payables | Level 3    
Disclosure of financial assets and liabilities [Line Items]    
Financial liabilities, at fair value 0 0
Not measured at fair value | Non-current receivables    
Disclosure of financial assets and liabilities [Line Items]    
Financial assets 1,625 13,880
Financial assets, at fair value 1,536 13,789
Not measured at fair value | Non-current receivables | Level 1    
Disclosure of financial assets and liabilities [Line Items]    
Financial assets, at fair value 0 0
Not measured at fair value | Non-current receivables | Level 2    
Disclosure of financial assets and liabilities [Line Items]    
Financial assets, at fair value 0 0
Not measured at fair value | Non-current receivables | Level 3    
Disclosure of financial assets and liabilities [Line Items]    
Financial assets, at fair value 1,536 13,789
Not measured at fair value | Lease receivables    
Disclosure of financial assets and liabilities [Line Items]    
Financial assets 2,854 2,854
Financial assets, at fair value 2,268 2,268
Not measured at fair value | Lease receivables | Level 1    
Disclosure of financial assets and liabilities [Line Items]    
Financial assets, at fair value 0 0
Not measured at fair value | Lease receivables | Level 2    
Disclosure of financial assets and liabilities [Line Items]    
Financial assets, at fair value 2,268 2,268
Not measured at fair value | Lease receivables | Level 3    
Disclosure of financial assets and liabilities [Line Items]    
Financial assets, at fair value 0 0
Not measured at fair value | Trade and other receivables    
Disclosure of financial assets and liabilities [Line Items]    
Financial assets 279,775 325,592
Financial assets, at fair value 0 0
Not measured at fair value | Trade and other receivables | Level 1    
Disclosure of financial assets and liabilities [Line Items]    
Financial assets, at fair value 0 0
Not measured at fair value | Trade and other receivables | Level 2    
Disclosure of financial assets and liabilities [Line Items]    
Financial assets, at fair value 0 0
Not measured at fair value | Trade and other receivables | Level 3    
Disclosure of financial assets and liabilities [Line Items]    
Financial assets, at fair value 0 0
Not measured at fair value | Cash and cash equivalents    
Disclosure of financial assets and liabilities [Line Items]    
Financial assets 429,370 179,929
Financial assets, at fair value 0 0
Not measured at fair value | Cash and cash equivalents | Level 1    
Disclosure of financial assets and liabilities [Line Items]    
Financial assets, at fair value 0 0
Not measured at fair value | Cash and cash equivalents | Level 2    
Disclosure of financial assets and liabilities [Line Items]    
Financial assets, at fair value 0 0
Not measured at fair value | Cash and cash equivalents | Level 3    
Disclosure of financial assets and liabilities [Line Items]    
Financial assets, at fair value 0 0
Not measured at fair value | Other financial liabilities    
Disclosure of financial assets and liabilities [Line Items]    
Financial liabilities 1,037,326 1,769,159
Not measured at fair value | Other financial liabilities | Secured bank loans    
Disclosure of financial assets and liabilities [Line Items]    
Financial liabilities 528,359 1,333,184
Not measured at fair value | Other financial liabilities | Unsecured other notes    
Disclosure of financial assets and liabilities [Line Items]    
Financial liabilities 201,952 197,556
Not measured at fair value | Other financial liabilities | Other borrowings    
Disclosure of financial assets and liabilities [Line Items]    
Financial liabilities 163,546 136,862
Not measured at fair value | Other financial liabilities | Lease liabilities    
Disclosure of financial assets and liabilities [Line Items]    
Financial liabilities 36,856 28,679
Not measured at fair value | Other financial liabilities | Trade and other payables    
Disclosure of financial assets and liabilities [Line Items]    
Financial liabilities 106,613 72,878
Not measured at fair value | Financial assets at amortised cost    
Disclosure of financial assets and liabilities [Line Items]    
Financial assets 713,624 522,255
Not measured at fair value | Financial assets at amortised cost | Non-current receivables    
Disclosure of financial assets and liabilities [Line Items]    
Financial assets 1,625 13,880
Not measured at fair value | Financial assets at amortised cost | Lease receivables    
Disclosure of financial assets and liabilities [Line Items]    
Financial assets 2,854 2,854
Not measured at fair value | Financial assets at amortised cost | Trade and other receivables    
Disclosure of financial assets and liabilities [Line Items]    
Financial assets 279,775 325,592
Not measured at fair value | Financial assets at amortised cost | Cash and cash equivalents    
Disclosure of financial assets and liabilities [Line Items]    
Financial assets $ 429,370 $ 179,929