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Geographic Information (Details) (USD $)
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3 Months Ended | ||
|---|---|---|---|
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Mar. 31, 2013
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Mar. 31, 2012
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Dec. 31, 2012
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| Revenues from External Customers and Long-Lived Assets [Line Items] | |||
| Assets: | $ 630,892,995 | $ 625,978,593 | $ 675,472,003 |
| Revenue: | 110,135,523 | 146,573,369 | |
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United States [Member]
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| Revenues from External Customers and Long-Lived Assets [Line Items] | |||
| Assets: | 560,468,546 | 597,558,426 | |
| Revenue: | 95,613,817 | 127,434,409 | |
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Canada [Member]
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| Revenues from External Customers and Long-Lived Assets [Line Items] | |||
| Assets: | 69,766,841 | 77,055,425 | |
| Revenue: | 13,660,424 | 17,635,632 | |
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Other [Member]
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| Revenues from External Customers and Long-Lived Assets [Line Items] | |||
| Assets: | 657,608 | 858,152 | |
| Revenue: | $ 861,282 | $ 1,503,328 | |
| X | ||||||||||
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- Definition
Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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