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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)