Annual report pursuant to Section 13 and 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) (Recurring, USD $)
Dec. 31, 2013
Dec. 31, 2012
Fair Value, Inputs, Level 2 | Interest Rate Swap
   
Assets, Fair Value Disclosure [Abstract]    
Interest rate swap instruments $ 1,553,224 $ 0
Liabilities, Fair Value Disclosure [Abstract]    
Interest rate swap instruments 4,267,644 8,214,582
Fair Value, Inputs, Level 3
   
Liabilities, Fair Value Disclosure [Abstract]    
Contingent consideration 0 1,147,408
Fair Value
   
Liabilities, Fair Value Disclosure [Abstract]    
Total $ 4,267,644 $ 9,361,990