Notes Payable (Details Textual) (USD $)	3 Months Ended
	Mar. 31, 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 Company's leverage ratio
Line Of Credit Facility, Amount Outstanding	9,000,000
Line Of Credit Facility Weighted Average Interest Rate	1.73%
Line Of Credit Facility Available For Borrowing Subject To Customary Condition	$ 76,000,000