Stockholder's Equity (Details Textuals) (USD $)	12 Months Ended					3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2010	Dec. 31, 2011	Mar. 31, 2012
Stockholders' Equity (Details) [Abstract]
Acquisitions of non controlling interests	$ 1,175,000	$ 23,247,000	$ 0
Equity issued in acquisition of noncontrolling interest		1,108,917
Percentage of partnership owned		20.00%
Total purchase price		91,000,000
Transaction costs existing partnership		$ 2,732,000
Preferred Stock [Line Items]
Preferred stock, shares issued	0	0	11,500,000
Preferred stock balance issued average rate	0	0	0.065
Series H Preferred Stock [Member]
Preferred Stock [Line Items]
Preferred stock, shares issued				349,854
Preferred stock balance issued average rate				0.06
Redemption date, preferred stock				Dec. 31, 2015
Initial conversion Price				$ 25
Liquidation value per preferred share				$ 25
Series I Preferred Stock [Member]
Preferred Stock [Line Items]
Preferred stock, shares issued					14,375,000
Preferred stock balance issued average rate					0.065
Equivalent Number Of Common Stock On Conversion Of Preferred Shares					0.846
Initial conversion Price					$ 59.1
Liquidation value per preferred share					$ 50
Series J Preferred Stock [Member]
Preferred Stock [Line Items]
Preferred stock, shares issued						11,500,000
Preferred stock balance issued average rate						0.065
Redemption date, preferred stock						Mar. 07, 2017
Initial conversion Price						$ 25