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Notes Payable (Details Textual) (USD $)
 6 Months Ended
Jun. 30, 2013
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 October 2017
Line of Credit Facility, Interest Rate Description interest at LIBOR plus a spread of 150 to 215 basis points depending on the Companys leverage ratio
Line of Credit Facility, Amount Outstanding 40,639,930
Line Of Credit Facility Weighted Average Interest Rate 1.82%
Line Of Credit Facility Available For Borrowing Subject To Customary Condition $ 44,360,070