Senior Notes, Secured, and Unsecured Indebtedness - Schedule of Maturities of Construction Notes Payable (Footnote) (Details)	3 Months Ended
	Mar. 31, 2016
Construction Notes Payable, March 2014, August 2015, November 2015, March 2016 | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	3.00%
Construction Notes Payable, March 2014, August 2015, November 2015, March 2016 | Prime rate
Debt Instrument [Line Items]
Basis spread on variable rate	1.00%
Construction Notes Payable, January 2016 | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	3.25%
Construction Notes Payable, November 2014, April 2015, July 2015 | Prime rate
Debt Instrument [Line Items]
Basis spread on variable rate	0.50%