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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Other operating expense (income) (Details) - USD ($) $ in Thousands | 12 Months Ended
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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) |  |

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- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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- Definition Revenue earned during the period from non-repayable sum of money awarded to an entity to carry out a specific purpose as provided in grant agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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