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INCOME TAXES - deferred tax assets and liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Deferred tax assets: |  |
Accrued warranty costs | $ 23,228 | $ 25,548
Bad debt allowance | 8,058 | 8,358
Investment in affiliates under tax equity transactions | 54,187 |
Inventory write-down | 4,564 | 4,239
Future deductible expenses | 13,321 | 13,878
Depreciation and impairment difference of property, plant and equipment and solar power systems | 29,668 | 34,248
Accrued liabilities related to countervailing and anti-dumping duty deposits | 111,021 | 55,115
Deferred tax assets relating to sales of solar power systems | 996 | 32,159
Net operating losses carry-forward | 48,678 | 70,637
Others | 7,728 | 8,532
Total deferred tax assets, gross | 301,449 | 252,714
Valuation allowance | (71,469) | (55,959)
Total deferred tax assets, net of valuation allowance | 229,980 | 196,755
Deferred tax liabilities: |  |
Derivative assets | 3,315 | 4,558
Depreciation difference of property, plant and equipment | 468 | 8,327
Deferred profit of projects |  | 40,793
Insurance recoverable | 16,727 | 15,000
Basis difference related to acquisitions |  | 18,339
Others | 2,838 | 3,047
Total deferred tax liabilities | 23,348 | 90,064
Analysis as: |  |
Current deferred tax assets |  | 30,013
Non-current deferred tax assets | 229,980 | 97,134
Current deferred tax liabilities |  | (1,426)
Non-current deferred tax liabilities | (23,348) | (19,030)
Net deferred tax assets | 206,632 | $ 106,691
Accumulated net operating losses | 273,840 |
Accumulated net operating losses subject to expiration between 2017 and 2036 | $ 137,065 |

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