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Borrowings - Maturity of Borrowings (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about borrowings [line items]      
Total debt $ 971,090 $ 968,280 $ 862,116
Borrowings excluding obligations under finance lease      
Disclosure of detailed information about borrowings [line items]      
Total debt 971,090 968,280  
Borrowings excluding obligations under finance lease | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 717,641 868,460  
Borrowings excluding obligations under finance lease | Variable interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 253,449 99,820  
Borrowings excluding obligations under finance lease | Less than 1 year | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 116,113 120,154  
Borrowings excluding obligations under finance lease | Less than 1 year | Variable interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 41,513 67,924  
Borrowings excluding obligations under finance lease | Between 1 and 2 years | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 52,175 46,247  
Borrowings excluding obligations under finance lease | Between 1 and 2 years | Variable interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 32,870 20,007  
Borrowings excluding obligations under finance lease | Between 2 and 3 years | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 39,844 55,453  
Borrowings excluding obligations under finance lease | Between 2 and 3 years | Variable interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 6,035 7,197  
Borrowings excluding obligations under finance lease | Between 3 and 4 years | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 12,500 40,725  
Borrowings excluding obligations under finance lease | Between 3 and 4 years | Variable interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 5,154 4,692  
Borrowings excluding obligations under finance lease | Between 4 and 5 years | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 0 10,331  
Borrowings excluding obligations under finance lease | Between 4 and 5 years | Variable interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 28,334 0  
Borrowings excluding obligations under finance lease | Over 5 Years | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 497,009 595,550  
Borrowings excluding obligations under finance lease | Over 5 Years | Variable interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt $ 139,543 $ 0