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FINANCIAL INSTRUMENTS (Carrying amounts and fair values) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Jan. 01, 2017
Financial liabilities at amortised cost | Accounts payable and accrued liabilities    
Disclosure Of Financial Assets And Liabilities [Line Items]    
Financial liabilities, carrying value $ 255,832 $ 231,927
Financial liabilities, fair value 255,832 231,927
Financial liabilities at amortised cost | Long-term debt | Effective interest rate    
Disclosure Of Financial Assets And Liabilities [Line Items]    
Financial liabilities, carrying value 430,000 400,000
Financial liabilities, fair value 430,000 400,000
Financial liabilities at amortised cost | Long-term debt | Fixed interest rate    
Disclosure Of Financial Assets And Liabilities [Line Items]    
Financial liabilities, carrying value 200,000 200,000
Financial liabilities, fair value 197,600 192,500
Derivative financial instruments designated as effective hedging instruments included in accounts payable and accrued liabilities    
Disclosure Of Financial Assets And Liabilities [Line Items]    
Financial liabilities, carrying value 2,644 1,515
Financial liabilities, fair value 2,644 1,515
Derivative financial instruments included in accounts payable and accrued liabilities - total return swap    
Disclosure Of Financial Assets And Liabilities [Line Items]    
Financial liabilities, carrying value 0 620
Financial liabilities, fair value 0 620
Financial assets at amortised cost | Cash and cash equivalents    
Disclosure Of Financial Assets And Liabilities [Line Items]    
Financial assets 52,795 38,197
Financial assets, fair value 52,795 38,197
Financial assets at amortised cost | Trade accounts receivable    
Disclosure Of Financial Assets And Liabilities [Line Items]    
Financial assets 243,365 277,733
Financial assets, fair value 243,365 277,733
Financial assets at amortised cost | Financial assets included in prepaid expenses, deposits and other current assets    
Disclosure Of Financial Assets And Liabilities [Line Items]    
Financial assets 28,711 22,722
Financial assets, fair value 28,711 22,722
Financial assets at amortised cost | Long-term non-trade receivables included in other non-current assets    
Disclosure Of Financial Assets And Liabilities [Line Items]    
Financial assets 2,781 476
Financial assets, fair value 2,781 476
Derivative financial instruments designated as effective hedging instruments included in prepaid expenses, deposits and other current assets    
Disclosure Of Financial Assets And Liabilities [Line Items]    
Financial assets 15,688 32,572
Financial assets, fair value 15,688 32,572
Derivative financial instruments included in prepaid expenses, deposits and other current assets - total return swap    
Disclosure Of Financial Assets And Liabilities [Line Items]    
Financial assets 1,232 0
Financial assets, fair value $ 1,232 $ 0