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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Disclosure of fair value measurement of assets [line items]    
Assets $ 1,537,454 $ 1,438,688
Total liabilities (513,526) (536,809)
Carrying value    
Disclosure of fair value measurement of assets [line items]    
Net assets (liabilities) (81,932) (20,758)
Carrying value | Non-current portion of debt    
Disclosure of fair value measurement of assets [line items]    
Total liabilities (233,180) (220,054)
Carrying value | Trade and receivables    
Disclosure of fair value measurement of assets [line items]    
Assets 14,848 36,236
Carrying value | Marketable securities (note 6)    
Disclosure of fair value measurement of assets [line items]    
Assets 114,001 148,944
Carrying value | Other financial assets    
Disclosure of fair value measurement of assets [line items]    
Assets 22,399 14,116
Fair value    
Disclosure of fair value measurement of assets [line items]    
Total liabilities (259,578) (245,515)
Net assets (liabilities) (108,330) (46,219)
Fair value | Non-current portion of debt    
Disclosure of fair value measurement of assets [line items]    
Total liabilities 259,578 (245,515)
Fair value | Trade and receivables    
Disclosure of fair value measurement of assets [line items]    
Assets 14,848 36,236
Fair value | Marketable securities (note 6)    
Disclosure of fair value measurement of assets [line items]    
Assets 114,001 148,944
Fair value | Other financial assets    
Disclosure of fair value measurement of assets [line items]    
Assets $ 22,399 $ 14,116