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Geographic Information (Details) (USD $)
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3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
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Sep. 30, 2012
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Sep. 30, 2011
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Sep. 30, 2012
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Sep. 30, 2011
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Dec. 31, 2011
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| Revenues from External Customers and Long-Lived Assets [Line Items] | |||||
| Assets | $ 681,699,498 | $ 788,433,613 | $ 681,699,498 | $ 788,433,613 | $ 645,597,467 |
| Revenue | 163,906,205 | 227,803,568 | 474,579,479 | 539,705,280 | |
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United States [Member]
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| Revenues from External Customers and Long-Lived Assets [Line Items] | |||||
| Assets | 611,550,045 | 611,550,045 | 576,695,791 | ||
| Revenue | 146,197,073 | 189,745,710 | 424,454,798 | 449,089,445 | |
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Canada [Member]
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| Revenues from External Customers and Long-Lived Assets [Line Items] | |||||
| Assets | 69,962,338 | 69,962,338 | 68,321,537 | ||
| Revenue | 16,141,540 | 37,235,830 | 44,433,346 | 89,063,210 | |
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Other [Member]
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| Revenues from External Customers and Long-Lived Assets [Line Items] | |||||
| Assets | 187,115 | 187,115 | 580,139 | ||
| Revenue | $ 1,567,592 | $ 822,028 | $ 5,691,335 | $ 1,552,625 | |