Selected Quarterly Financial Data (Unaudited) - Schedule of Selected Quarterly Financial Data (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Total Income	$ 25,143,697	$ 25,355,051	$ 25,210,707	$ 23,504,374	$ 21,924,143	$ 21,694,999	$ 19,553,443	$ 18,344,086	$ 99,213,829	$ 81,516,671	$ 71,431,933
Total Expenses	20,634,766	21,567,389	21,176,977	19,876,382	19,256,221	18,965,700	17,484,822	16,369,803	83,255,514	72,076,546	64,521,158
Other Income (Expense)	(1,153,663)	(587,077)	(937,242)	(1,743,611)	(2,479,582)	(1,684,881)	(1,790,710)	(1,260,479)	(4,421,593)	(7,215,652)	(2,680,285)
Net Income	3,376,615	3,200,013	3,051,462	1,906,469	174,461	1,047,245	203,982	718,517	11,534,559	2,144,205	4,237,803
Net Loss Attributable to Common Shareholders	$ (413,132)	$ (589,734)	$ (682,729)	$ (883,278)	$ (2,425,296)	$ (841,902)	$ (1,685,165)	$ (1,170,630)	$ (2,568,873)	$ (6,122,993)	$ (3,318,785)
Net Loss Attributable to Common Shareholders Per Share - Basic and Diluted	$ (0.01)	$ (0.02)	$ (0.03)	$ (0.03)	$ (0.10)	$ (0.03)	$ (0.06)	$ (0.05)	$ (0.09)	$ (0.24)	$ (0.15)