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Senior convertible notes (Details Textual) (USD $) | 1 Months Ended |  |  | 1 Months Ended |  |
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Aug. 31, 2010 Senior convertible notes due august 15 2015 [Member] | Sep. 30, 2012 Senior convertible notes due august 15 2015 [Member] | Dec. 31, 2011 Senior convertible notes due august 15 2015 [Member] | Dec. 31, 2006 Senior convertible notes due december 15 2013 [Member] | Sep. 30, 2012 Senior convertible notes due december 15 2013 [Member] | Dec. 31, 2011 Senior convertible notes due december 15 2013 [Member]
Senior convertible notes (Textual) [Abstract] |  |  |  |  |  |
Principal amount | $ 100,000,000 | $ 100,000,000 | $ 100,000,000 | $ 115,000,000 | $ 115,000,000 | $ 115,000,000
Senior notes, effective interest rate | 5.75% | 5.75% |  | 3.75% |  |
Accrued interest |  | 735,000 | 2,200,000 |  | 192,000 | 1,300,000
No of convertible shares | 147.0859 |  |  | 44.5002 |  |
Principal amount per share | $ 1,000 |  |  | $ 1,000 |  |
Conversion price of shares |  | $ 6.80 |  |  | $ 22.47 |
Issuance cost | $ 4,200,000 |  |  | $ 3,700,000 |  |
Percentage of repurchase price | 100.00% |  |  | 100.00% |  |
Percentage of redemption price | 100.00% |  |  |  |  |
Percentage of conversion price equaling stock price | 150.00% |  |  |  |  |
Consecutive trading days | Least 20 of the 30 |  |  |  |  |

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