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Management of Financial Risk (Schedule of Company's Liquidity Risk) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Other non-current liabilities $ 1,356 $ 3,544
Liquidity risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Trade and other payables 41,476 40,160
Bank loan 40,000 40,000
Derivative liabilities 2,328 254
Income tax payable 14,237 14,447
Finance lease obligations 906 3,101
Other non-current liabilities 1,356 3,544
Operating leases 2,312 873
Provisions 15,186 14,228
Total financial liabilities 117,801 116,607
Liquidity risk [member] | Not later than one year [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Trade and other payables 41,476 40,160
Derivative liabilities 2,328 254
Income tax payable 14,237 14,447
Finance lease obligations 906 2,189
Operating leases 653 431
Provisions 1,708 1,154
Total financial liabilities 61,308 58,635
Liquidity risk [member] | Later than one year and not later than three years [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Bank loan 40,000 40,000
Finance lease obligations   912
Other non-current liabilities 1,356 3,544
Operating leases 1,025 360
Provisions 4,690 2,728
Total financial liabilities 47,071 47,544
Liquidity risk [member] | Later than three years and not later than five years [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Operating leases 634 82
Provisions 5,465 5,172
Total financial liabilities 6,099 5,254
Liquidity risk [member] | Later than five years [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Provisions 3,323 5,174
Total financial liabilities $ 3,323 $ 5,174