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Geographic Information (Details) (USD $)
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3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
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Jun. 30, 2013
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Jun. 30, 2012
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Jun. 30, 2013
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Jun. 30, 2012
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Dec. 31, 2012
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| Revenues from External Customers and Long-Lived Assets [Line Items] | |||||
| Assets: | $ 619,949,075 | $ 660,675,789 | $ 619,949,075 | $ 660,675,789 | $ 675,472,003 |
| Revenue: | 126,252,694 | 164,099,905 | 236,388,217 | 310,673,274 | |
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United States [Member]
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| Revenues from External Customers and Long-Lived Assets [Line Items] | |||||
| Assets: | 542,374,982 | 542,374,982 | 597,558,426 | ||
| Revenue: | 109,697,837 | 150,823,316 | 205,311,654 | 278,257,725 | |
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Canada [Member]
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| Revenues from External Customers and Long-Lived Assets [Line Items] | |||||
| Assets: | 66,987,336 | 66,987,336 | 77,055,425 | ||
| Revenue: | 16,125,048 | 10,656,174 | 29,785,472 | 28,291,806 | |
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Other [Member]
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| Revenues from External Customers and Long-Lived Assets [Line Items] | |||||
| Assets: | 10,586,757 | 10,586,757 | 858,152 | ||
| Revenue: | $ 429,809 | $ 2,620,415 | $ 1,291,091 | $ 4,123,743 | |