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Summarized 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
Summary of quarterly financial information                      
Revenues $ 43,534,781 $ 37,651,354 $ 35,521,672 $ 34,408,999 $ 38,912,952 $ 37,074,759 $ 41,534,386 $ 33,225,219 $ 151,116,806 $ 150,747,316 $ 123,989,917
Income from Operations 3,009,214 6,161,418 5,099,534 6,708,500 7,647,150 7,532,363 8,088,971 6,842,861 20,978,666 30,111,345 21,985,984
Net income $ 2,001,111 $ 4,379,071 $ 3,610,790 $ 4,681,691 $ 5,503,030 $ 5,431,760 $ 5,860,950 $ 4,852,924 $ 14,672,663 $ 21,648,664 $ 15,551,536
Net income per share:                      
Net income per share $ 0.11 $ 0.24 $ 0.20 $ 0.25 $ 0.30 $ 0.30 $ 0.32 $ 0.26 $ 0.79 $ 1.18 $ 0.89
Diluted income per share $ 0.11 $ 0.24 $ 0.20 $ 0.25 $ 0.30 $ 0.30 $ 0.32 $ 0.26 $ 0.79 $ 1.18 $ 0.89