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QUARTERLY FINANCIAL DATA - (UNAUDITED) (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
QUARTERLY FINANCIAL DATA - (UNAUDITED) |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 57,053 | $ 41,835 | $ 30,384 | $ 67,045 | $ 39,552 | $ 31,013 | $ 30,216 | $ 50,247 | $ 196,317,215 | $ 151,028,582 | $ 108,318,801
Income from operations | 7,069 | 2,096 | (2,860) | 20,475 | 6,048 | 1,889 | 1,214 | 9,014 | 26,779,411 | 18,164,890 | 147,635
Net income (loss) | $ 4,150 | $ 1,112 | $ (1,974) | $ 12,384 | $ 3,436 | $ 1,047 | $ 587 | $ 5,764 | $ 15,671,879 | $ 10,833,215 | $ (1,222,682)
Net income (loss) per share basic | $ 0.20 | $ 0.05 | $ (0.10) | $ 0.61 | $ 0.17 | $ 0.05 | $ 0.03 | $ 0.29 | $ 0.76 | $ 0.54 | $ (0.06)
Net income (loss) per share diluted | $ 0.20 | $ 0.05 | $ (0.10) | $ 0.60 | $ 0.17 | $ 0.05 | $ 0.03 | $ 0.28 | $ 0.75 | $ 0.53 | $ (0.06)

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