XML 144 R110.htm IDEA: XBRL DOCUMENT v3.8.0.1
FINANCIAL RISK MANAGEMENT - Credit Risk (Details) - Credit risk - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Disclosure of credit risk exposure [line items]    
Maximum exposure to credit risk $ 510,866 $ 397,472
Cash and cash equivalents    
Disclosure of credit risk exposure [line items]    
Maximum exposure to credit risk 459,864 327,127
Value added tax receivable    
Disclosure of credit risk exposure [line items]    
Maximum exposure to credit risk 13,755 19,993
Trade receivables and other assets    
Disclosure of credit risk exposure [line items]    
Maximum exposure to credit risk 14,848 36,236
Other financial assets    
Disclosure of credit risk exposure [line items]    
Maximum exposure to credit risk $ 22,399 $ 14,116