Notes Payable (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Line of Credit Facility, Current Borrowing Capacity	$ 85,000,000
Line of Credit Facility, Maximum Borrowing Capacity	135,000,000
Line of Credit Facility, Expiration Date	Oct. 26, 2015
Extension Options	two-one year
Line Of Credit Facility Extension Option Expiration Date	Oct- 26-2017
Line of Credit Facility, Interest Rate Description	interest at LIBOR plus a spread of 150 to 215 basis points depending on the Company's leverage ratio.
Line of Credit Facility, Amount Outstanding	43,530,005	56,443,898
Line Of Credit Facility Weighted Average Interest Rate	2.39%	2.18%
Line of Credit Facility, Remaining Borrowing Capacity	$ 41,469,995