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Borrowings - Maturity of Borrowings (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about borrowings [line items]      
Total debt $ 968,280 $ 862,116 $ 817,958
Borrowings excluding obligations under finance lease      
Disclosure of detailed information about borrowings [line items]      
Total debt 968,280 861,521  
Borrowings excluding obligations under finance lease | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 868,460 723,077  
Borrowings excluding obligations under finance lease | Variable interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 99,820 138,444  
Borrowings excluding obligations under finance lease | Less than 1 year | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 120,154 105,708  
Borrowings excluding obligations under finance lease | Less than 1 year | Variable interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 67,924 37,724  
Borrowings excluding obligations under finance lease | Between 1 and 2 years | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 46,247 16,287  
Borrowings excluding obligations under finance lease | Between 1 and 2 years | Variable interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 20,007 17,278  
Borrowings excluding obligations under finance lease | Between 2 and 3 years | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 55,453 25,704  
Borrowings excluding obligations under finance lease | Between 2 and 3 years | Variable interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 7,197 29,861  
Borrowings excluding obligations under finance lease | Between 3 and 4 years | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 40,725 43,507  
Borrowings excluding obligations under finance lease | Between 3 and 4 years | Variable interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 4,692 22,886  
Borrowings excluding obligations under finance lease | Between 4 and 5 years | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 10,331 26,415  
Borrowings excluding obligations under finance lease | Between 4 and 5 years | Variable interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 0 18,251  
Borrowings excluding obligations under finance lease | Over 5 Years | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 595,550 505,456  
Borrowings excluding obligations under finance lease | Over 5 Years | Variable interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt $ 0 $ 12,444