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Borrowings - Maturity of Borrowings (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about borrowings [line items]      
Total debt $ 817,651 $ 971,090 $ 968,280
Borrowings excluding obligations under finance lease      
Disclosure of detailed information about borrowings [line items]      
Total debt 817,651 971,090  
Borrowings excluding obligations under finance lease | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 626,807 717,641  
Borrowings excluding obligations under finance lease | Variable interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 190,844 253,449  
Borrowings excluding obligations under finance lease | Less than 1 year | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 104,349 116,113  
Borrowings excluding obligations under finance lease | Less than 1 year | Variable interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 7,815 41,513  
Borrowings excluding obligations under finance lease | Between 1 and 2 years | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 12,503 52,175  
Borrowings excluding obligations under finance lease | Between 1 and 2 years | Variable interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 5,075 32,870  
Borrowings excluding obligations under finance lease | Between 2 and 3 years | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 12,500 39,844  
Borrowings excluding obligations under finance lease | Between 2 and 3 years | Variable interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 31,754 6,035  
Borrowings excluding obligations under finance lease | Between 3 and 4 years | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 0 12,500  
Borrowings excluding obligations under finance lease | Between 3 and 4 years | Variable interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 29,255 5,154  
Borrowings excluding obligations under finance lease | Between 4 and 5 years | Variable interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 71,045 28,334  
Borrowings excluding obligations under finance lease | Over 5 Years | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 497,455 497,009  
Borrowings excluding obligations under finance lease | Over 5 Years | Variable interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt $ 45,900 $ 139,543