Notes Payable and Accrued Interest (Details) (USD $)	3 Months Ended		12 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2014	Dec. 31, 2013
Notes payable and accrued interest [Abstract]
Notes payable and accrued interest			$ 133,590,600	$ 77,527,300
Credit Facility [Abstract]
Impairment charges	11,718,700	6,800,000	18,736,500	0
Credit Facility [Member]
Notes payable and accrued interest [Abstract]
Credit Facility principal			133,400,000	77,500,000
Credit Facility accrued interest			190,600	27,300
Notes payable and accrued interest			133,590,600	77,527,300
Credit Facility [Abstract]
Credit facility, borrowing capacity replaced			130,000,000
Credit facility maximum borrowing capacity			180,000,000
Expiration date			May 31, 2019
Credit facility			150,000,000
Number of participant lenders departed			2
Credit facility maximum borrowing capacity replaced			200,000,000
Unused amount of the credit facility			$ 16,600,000	$ 52,500,000
Weighted average interest rate on credit facility (in hundredths)			3.58%	3.94%