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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Other operating expense (income) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other operating expense (income)      
Amortization of deferred subsidiaries $ 103    
Net gain on disposal of solar power systems (27,803) $ (47,899)  
Net loss on disposal of property, plant and equipment 1,960 8,094 $ 1,801
Government grants (6,473) (2,734) (7,193)
Business interruption insurance compensation (15,238)    
Other operating income, net (47,554) $ (42,539) $ (5,392)
Land use rights      
Other operating expense (income)      
Government grants $ (4,329)