Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurement - Fair Value of Liabilities Measured on a Recurring Basis (Details)

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Fair Value Measurement - Fair Value of Liabilities Measured on a Recurring Basis (Details) (Fair Value, Measurements, Recurring [Member], USD $)
Jun. 30, 2013
Dec. 31, 2012
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]
   
Assets:    
Derivative instruments $ 811,084 $ 0
Liabilities:    
Derivative instruments 5,023,026 8,214,582
Fair Value, Inputs, Level 3 [Member]
   
Liabilities:    
Contingent consideration 1,147,408 1,147,408
Estimate of Fair Value, Fair Value Disclosure [Member]
   
Liabilities:    
Total liabilities $ 6,170,434 $ 9,361,990