Debt - Components of Mortgage Debt (Footnotes) (Details) - Senior Unsecured Revolving Credit Facility	3 Months Ended
	Mar. 31, 2016
LIBOR | Minimum
Participating Mortgage Loans [Line Items]
Basis spread on variable rate	1.55%
LIBOR | Maximum
Participating Mortgage Loans [Line Items]
Basis spread on variable rate	2.30%
Prime Rate | Minimum
Participating Mortgage Loans [Line Items]
Basis spread on variable rate	0.55%
Prime Rate | Maximum
Participating Mortgage Loans [Line Items]
Basis spread on variable rate	1.30%