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Financial - risk management objectives and policies - Aging of financial liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Disclosure of financial risk management objectives and policies [line items]    
Financial liabilities, undiscounted contractual payments $ 870,915 $ 964,869
Less than one year [member]    
Disclosure of financial risk management objectives and policies [line items]    
Financial liabilities, undiscounted contractual payments 496,006 349,607
Between 1 and 2 years [member]    
Disclosure of financial risk management objectives and policies [line items]    
Financial liabilities, undiscounted contractual payments 145,086 375,399
More than 5 years    
Disclosure of financial risk management objectives and policies [line items]    
Financial liabilities, undiscounted contractual payments 144,640 207,391
Later ThanTwo Year And Not LaterThan Five Year Member [Member]    
Disclosure of financial risk management objectives and policies [line items]    
Financial liabilities, undiscounted contractual payments 85,183 32,472
Bank loans [Member]    
Disclosure of financial risk management objectives and policies [line items]    
Financial liabilities, undiscounted contractual payments 55,486 95,613
Bank loans [Member] | Less than one year [member]    
Disclosure of financial risk management objectives and policies [line items]    
Financial liabilities, undiscounted contractual payments 55,486 95,613
Bank loans [Member] | Between 1 and 2 years [member]    
Disclosure of financial risk management objectives and policies [line items]    
Financial liabilities, undiscounted contractual payments 0 0
Bank loans [Member] | More than 5 years    
Disclosure of financial risk management objectives and policies [line items]    
Financial liabilities, undiscounted contractual payments 0 0
Bank loans [Member] | Later ThanTwo Year And Not LaterThan Five Year Member [Member]    
Disclosure of financial risk management objectives and policies [line items]    
Financial liabilities, undiscounted contractual payments 0 0
Trade and other payables [Member]    
Disclosure of financial risk management objectives and policies [line items]    
Financial liabilities, undiscounted contractual payments 152,686 177,450
Trade and other payables [Member] | Less than one year [member]    
Disclosure of financial risk management objectives and policies [line items]    
Financial liabilities, undiscounted contractual payments 152,070 176,811
Trade and other payables [Member] | Between 1 and 2 years [member]    
Disclosure of financial risk management objectives and policies [line items]    
Financial liabilities, undiscounted contractual payments 616 639
Trade and other payables [Member] | More than 5 years    
Disclosure of financial risk management objectives and policies [line items]    
Financial liabilities, undiscounted contractual payments 0 0
Trade and other payables [Member] | Later ThanTwo Year And Not LaterThan Five Year Member [Member]    
Disclosure of financial risk management objectives and policies [line items]    
Financial liabilities, undiscounted contractual payments 0 0
Financial Obligation Capital [Member]    
Disclosure of financial risk management objectives and policies [line items]    
Financial liabilities, undiscounted contractual payments 567,398 588,030
Financial Obligation Capital [Member] | Less than one year [member]    
Disclosure of financial risk management objectives and policies [line items]    
Financial liabilities, undiscounted contractual payments 262,088 46,166
Financial Obligation Capital [Member] | Between 1 and 2 years [member]    
Disclosure of financial risk management objectives and policies [line items]    
Financial liabilities, undiscounted contractual payments 131,588 346,401
Financial Obligation Capital [Member] | More than 5 years    
Disclosure of financial risk management objectives and policies [line items]    
Financial liabilities, undiscounted contractual payments 125,154 195,463
Financial Obligation Capital [Member] | Later ThanTwo Year And Not LaterThan Five Year Member [Member]    
Disclosure of financial risk management objectives and policies [line items]    
Financial liabilities, undiscounted contractual payments 48,568 0
Financial Obligation Interest [Member]    
Disclosure of financial risk management objectives and policies [line items]    
Financial liabilities, undiscounted contractual payments 47,151 65,400
Financial Obligation Interest [Member] | Less than one year [member]    
Disclosure of financial risk management objectives and policies [line items]    
Financial liabilities, undiscounted contractual payments 22,597 31,017
Financial Obligation Interest [Member] | Between 1 and 2 years [member]    
Disclosure of financial risk management objectives and policies [line items]    
Financial liabilities, undiscounted contractual payments 11,225 28,359
Financial Obligation Interest [Member] | More than 5 years    
Disclosure of financial risk management objectives and policies [line items]    
Financial liabilities, undiscounted contractual payments 11,880 6,024
Financial Obligation Interest [Member] | Later ThanTwo Year And Not LaterThan Five Year Member [Member]    
Disclosure of financial risk management objectives and policies [line items]    
Financial liabilities, undiscounted contractual payments 1,449 0
Lease Capital [Member]    
Disclosure of financial risk management objectives and policies [line items]    
Financial liabilities, undiscounted contractual payments 7,503  
Lease Capital [Member] | Less than one year [member]    
Disclosure of financial risk management objectives and policies [line items]    
Financial liabilities, undiscounted contractual payments 3,692  
Lease Capital [Member] | Between 1 and 2 years [member]    
Disclosure of financial risk management objectives and policies [line items]    
Financial liabilities, undiscounted contractual payments 1,514  
Lease Capital [Member] | More than 5 years    
Disclosure of financial risk management objectives and policies [line items]    
Financial liabilities, undiscounted contractual payments 2,297  
Lease Capital [Member] | Later ThanTwo Year And Not LaterThan Five Year Member [Member]    
Disclosure of financial risk management objectives and policies [line items]    
Financial liabilities, undiscounted contractual payments 0  
Lease Interest [Member]    
Disclosure of financial risk management objectives and policies [line items]    
Financial liabilities, undiscounted contractual payments 620  
Lease Interest [Member] | Less than one year [member]    
Disclosure of financial risk management objectives and policies [line items]    
Financial liabilities, undiscounted contractual payments 73  
Lease Interest [Member] | Between 1 and 2 years [member]    
Disclosure of financial risk management objectives and policies [line items]    
Financial liabilities, undiscounted contractual payments 143  
Lease Interest [Member] | More than 5 years    
Disclosure of financial risk management objectives and policies [line items]    
Financial liabilities, undiscounted contractual payments 404  
Lease Interest [Member] | Later ThanTwo Year And Not LaterThan Five Year Member [Member]    
Disclosure of financial risk management objectives and policies [line items]    
Financial liabilities, undiscounted contractual payments 0  
Contingent consideration liability [Member]    
Disclosure of financial risk management objectives and policies [line items]    
Financial liabilities, undiscounted contractual payments 40,071 38,376
Contingent consideration liability [Member] | Less than one year [member]    
Disclosure of financial risk management objectives and policies [line items]    
Financial liabilities, undiscounted contractual payments 0 0
Contingent consideration liability [Member] | Between 1 and 2 years [member]    
Disclosure of financial risk management objectives and policies [line items]    
Financial liabilities, undiscounted contractual payments 0 0
Contingent consideration liability [Member] | More than 5 years    
Disclosure of financial risk management objectives and policies [line items]    
Financial liabilities, undiscounted contractual payments 4,905 5,904
Contingent consideration liability [Member] | Later ThanTwo Year And Not LaterThan Five Year Member [Member]    
Disclosure of financial risk management objectives and policies [line items]    
Financial liabilities, undiscounted contractual payments $ 35,166 $ 32,472