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SIGNIFICANT ACCOUNTING POLICIES - Leasing (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Leasing      
Minimum lease payments receivable $ 3,638 $ 4,313 $ 3,563
IPP solar parks      
Leasing      
Minimum lease payments receivable $ 0