Notes Payable (Details Textual) (USD $)	9 Months Ended
	Sep. 30, 2012
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, 2014
Extension Options	two-one year
Line Of Credit Facility Extension Option Expiration Date	October 2016
Line of Credit Facility, Interest Rate Description	interest at LIBOR plus a spread of 175 to 260 basis points depending on the Company's leverage ratio
Line of Credit Facility, Amount Outstanding	54,840,000
Line Of Credit Facility Weighted Average Interest Rate	2.18%
Line Of Credit Facility Available For Borrowing Subject To Customary Condition	$ 30,160,000