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Financial Statements Schedule I (Details 6) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Operating activities: |  |  |
Net income (loss) | $ (195,155,097) | $ (90,903,374) | $ 50,828,396
Depreciation and amortization | 81,398,470 | 56,117,280 | 31,266,181
Allowance for doubtful debts | 43,611,217 | 23,156,857 | 3,046,100
Investment loss | 1,081,700 |  | 3,000,000
Amortization of discount on debt | 49,699 | 44,485 | 39,816
Share-based compensation | 5,185,242 | 4,060,838 | 3,876,671
Changes in operating assets and liabilities: |  |  |
Inventories | 3,960,749 | (28,798,943) | (103,637,355)
Accounts receivable | (6,983,739) | (103,748,565) | (5,704,039)
Amount due from related parties | 9,904,520 | (18,135,684) | (1,347,828)
Advances to suppliers | (17,898,461) | 13,458,006 | 2,227,991
Other non-current assets | (24,406,669) | (9,257,048) | (5,826,029)
Accounts payable | 56,238,301 | 52,435,834 | 18,096,208
Advances from customers | (46,127,125) | 56,706,824 | 5,120,313
Amounts due to related parties | 2,015,133 | 484,649 | 2,163,515
Accrued warranty costs | 11,334,395 | 15,737,987 | 14,259,880
Other current liabilities | 59,188,516 | (744,073) | 18,875,491
Liability for uncertain tax positions | 2,502,791 | 840,611 | 755,414
Deferred taxes |  | (4,632,976) | (5,179,877)
Net cash provided by (used in) operating activities | (147,758,937) | 60,124,114 | (58,487,119)
Investing activities: |  |  |
Decrease (increase) in restricted cash | (243,137,142) | 23,614,897 | (987,019)
Investment in subsidiaries | (3,428,751) | (5,667,627) | (1,503,531)
Purchase of property, plant and equipment | (60,481,021) | (205,419,189) | (134,314,791)
Net cash used in investing activities | (306,491,439) | (193,576,742) | (133,988,954)
Financing activities: |  |  |
Proceeds from short-term borrowings | 791,596,176 | 1,808,463,199 | 917,514,400
Proceeds from long-term borrowings | 143,965,319 | 89,023,852 | 89,659,607
Proceeds from issuance of warrants | 2,500,000 |  |
Proceeds from exercise of stock options | 158,766 | 1,256,948 | 823,560
Net cash provided by financing activities | 249,575,744 | 177,748,225 | 312,629,005
Effect of exchange rate changes | 2,648,135 | 11,047,381 | 8,387,882
Net increase (decrease) in cash and cash equivalents | (202,026,497) | 55,342,978 | 128,540,814
Cash and cash equivalents at the beginning of the year | 343,994,679 | 288,651,701 | 160,110,887
Cash and cash equivalents at the end of the year | 141,968,182 | 343,994,679 | 288,651,701
Supplemental disclosure of cash flow information: |  |  |
Interest paid, net of amounts capitalized | 57,914,890 | 46,345,299 | 21,211,228
Income taxes paid | 9,698,512 | 30,929,617 | 13,635,216
Parent Company |  |  |
Operating activities: |  |  |
Net income (loss) | (195,468,691) | (90,804,200) | 50,568,919
Depreciation and amortization | 6,950 | 5,864 | 5,888
Allowance for doubtful debts | 8,369,187 | 5,829,275 | (7,327,386)
Investment loss |  |  | 3,000,000
Amortization of discount on debt | 49,699 | 44,485 | 39,816
Equity in earnings (loss) of subsidiaries | 203,562,719 | 98,774,339 | (39,576,838)
Share-based compensation | 5,185,242 | 4,060,838 | 3,876,671
Changes in operating assets and liabilities: |  |  |
Inventories | 9,840,507 | 17,598,617 | 2,140,423
Accounts receivable | (1,317,532) | 99,826,223 | 37,753,416
Amount due from related parties | (121,173,334) | (126,832,013) | (16,299,621)
Advances to suppliers | (293,911) | 11,973,762 | 2,752,935
Other current assets | (7,540,414) | 6,399,566 | (4,195,539)
Other non-current assets | (20,387,009) | (9,177,091) | (5,786,798)
Accounts payable | 79 | (10,083,933) | 3,937,109
Advances from customers | (452,417) | (216,370) | 130,350
Amounts due to related parties | (18,298,349) | 17,530,108 | (23,827,298)
Accrued warranty costs | 431,138 | 5,416,935 | 11,874,837
Other current liabilities | (4,255,036) | (9,034,605) | 10,848,840
Liability for uncertain tax positions | 1,975,793 | 103,902 | 755,415
Deferred taxes | 5,718,014 | 384,345 | 392,598
Net cash provided by (used in) operating activities | (134,047,365) | 21,800,047 | 31,063,737
Investing activities: |  |  |
Decrease (increase) in restricted cash | 5,731,365 | 25,894,969 | (31,476,334)
Investment in subsidiaries | (13,319,864) | (75,955,691) | (45,851,545)
Purchase of property, plant and equipment | (3,589) |  | (1,172)
Net cash used in investing activities | (7,592,088) | (50,060,722) | (77,329,051)
Financing activities: |  |  |
Proceeds from short-term borrowings | 68,000,000 |  |
Proceeds from long-term borrowings | 70,063,488 |  |
Payment for repurchase of convertible notes | (1,000,000) |  |
Proceeds from issuance of warrants | 2,500,000 |  |
Proceeds from exercise of stock options | 158,766 | 1,256,948 | 823,560
Net cash provided by financing activities | 139,722,254 | 1,256,948 | 823,560
Effect of exchange rate changes | 5,239,819 | 17,093,770 | 13,340,647
Net increase (decrease) in cash and cash equivalents | 3,322,620 | (9,909,957) | (32,101,107)
Cash and cash equivalents at the beginning of the year | 7,924,686 | 17,834,643 | 49,935,750
Cash and cash equivalents at the end of the year | 11,247,306 | 7,924,686 | 17,834,643
Supplemental disclosure of cash flow information: |  |  |
Interest paid, net of amounts capitalized | 255,502 | 223,495 | 296,678
Income taxes paid | $ 290,813 | $ 13,575,821 | $ 5,204,641

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