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LONG-TERM DEBT - Other Loans (Details)
$ in Thousands, $ in Millions
12 Months Ended
Jun. 30, 2017
CAD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
CAD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
CAD ($)
Dec. 31, 2016
USD ($)
LONG-TERM DEBT                
Scheduled repayment         $ 410,412 $ 405,374    
Principal         1,371,851     $ 1,202,686
Other Loans                
LONG-TERM DEBT                
Scheduled repayment $ 20.0 $ 14,900 $ 20.0 $ 15,400        
Principal         $ 0   $ 20.0 $ 14,900