Outstanding warrants (Details)
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Dec. 31, 2012
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Oct. 31, 2009
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Class of Warrant or Right [Line Items] | ||
Outstanding warrants to purchase membership units | 62,280 | |
Exercise price of warrants | 22.94 | |
Minimum [Member]
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Class of Warrant or Right [Line Items] | ||
Exercise price of warrants | 22.94 | |
Maximum [Member]
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Class of Warrant or Right [Line Items] | ||
Exercise price of warrants | 32.00 |
X | ||||||||||
- Definition
Exercise price per share or per unit of warrants or rights outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Details
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X | ||||||||||
- Definition
Number of warrants or rights outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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