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CAPITAL AND FINANCIAL RISK MANAGEMENT - Credit Risk and Capital Risk Management (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
CAPITAL AND FINANCIAL RISK MANAGEMENT      
Cash and cash equivalents $ 632,978 $ 539,974 $ 124,150
Short- term investments 10,919 8,424  
Long-term debt 1,371,851 1,072,790  
Total equity 4,946,991 4,492,474 $ 4,141,020
Credit Risk      
CAPITAL AND FINANCIAL RISK MANAGEMENT      
Cash and cash equivalents 632,978 539,974  
Short- term investments 10,919 8,424  
Restricted cash 1,223 1,162  
Trade receivables 12,000 8,185  
Derivative financial instrument assets 17,240 364  
Total 674,360 558,109  
Capital Risk      
CAPITAL AND FINANCIAL RISK MANAGEMENT      
Long-term debt 1,371,851 1,202,686  
Total equity 4,946,991 4,492,474  
Total $ 6,318,842 $ 5,695,160