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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Other operating expense (income) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Other operating expense (income)      
Amortization of deferred subsidiaries $ 17    
Net gain on disposal of solar power systems (47,899)    
Net loss on disposal of property, plant and equipment 8,094 $ 1,801 $ 1,478
Government grants (2,734) (7,193) (5,801)
Other operating income, net (42,539) $ (5,392) $ (4,323)
Land use rights      
Other operating expense (income)      
Government grants $ (3,416)