Quarterly report pursuant to Section 13 or 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 $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Pro forma:        
Revenue   $ 238,048,397   $ 592,947,701
Income   12,312,191   25,082,193
Basic earnings per share   $ 0.29   $ 0.59
Diluted earnings per share   $ 0.27   $ 0.55
Actual:        
Revenue 163,906,205 227,803,568 474,579,479 539,705,280
Income $ 6,771,182 $ 12,358,580 $ 13,445,348 $ 26,478,993
Basic earnings per share $ 0.15 $ 0.29 $ 0.30 $ 0.63
Diluted earnings per share $ 0.15 $ 0.27 $ 0.29 $ 0.58