Schedule III - Real Estate and Accumulated Depreciation (Details) - Reconciliation of Accumulated Depreciation (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reconciliation of Accumulated Depreciation [Abstract]
Balance at beginning of period:	$ 57,499,980	$ 32,364,772	$ 14,451,032
Depreciation expenses	38,890,425	25,653,359	17,913,740
Properties sold during the year	(2,081,460)	(433,342)
Property assets fully depreciated and written off	(6,135,611)	(84,809)
Balance at end of period:	$ 88,173,334	$ 57,499,980	$ 32,364,772