Annual report pursuant to Section 13 and 15(d)

Business Acquisitions and Related Transactions - Pro Forma Information (Details)

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Business Acquisitions and Related Transactions - Pro Forma Information (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Pro forma:    
Revenue $ 631,170,565 $ 783,303,331
Income $ 18,360,133 $ 30,776,678
Basic earnings per share $ 0.41 $ 0.72
Diluted earnings per share $ 0.40 $ 0.69