Debt (Mortgage Notes Payable) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Extinguishment of Debt [Line Items]
Loans Obtained/Assumed	$ 36,100
Loans Repaid [Member]
Extinguishment of Debt [Line Items]
Loans Repaid	129,319		178,200
Interest Rate	6.10%	[1]	5.80%	[1]
Loans Repaid [Member] | Annen Woods [Member]
Extinguishment of Debt [Line Items]
Loans Repaid	12,740
Interest Rate	6.10%	[2]
Loans Repaid [Member] | Cypress Shores [Member]
Extinguishment of Debt [Line Items]
Loans Repaid	26,746
Interest Rate	6.10%	[2]
Loans Repaid [Member] | Hampton Point [Member]
Extinguishment of Debt [Line Items]
Loans Repaid	32,279
Interest Rate	6.10%	[2]
Loans Repaid [Member] | Reflections [Member]
Extinguishment of Debt [Line Items]
Loans Repaid	19,025
Interest Rate	6.10%	[2]
Loans Repaid [Member] | Windsor Pines [Member]
Extinguishment of Debt [Line Items]
Loans Repaid	38,529
Interest Rate	6.10%	[2]
Loans Obtained/Assumed [Member]
Extinguishment of Debt [Line Items]
Interest Rate	3.60%	[1]
Loans Obtained/Assumed [Member] | The Apartments at Blakeney [Member]
Extinguishment of Debt [Line Items]
Interest Rate	4.20%	[3]
Loans Obtained/Assumed	28,000
Loans Obtained/Assumed [Member] | 7001 Arlington Road [Member]
Extinguishment of Debt [Line Items]
Interest Rate	1.40%	[4]
Loans Obtained/Assumed	2,182
Loans Obtained/Assumed [Member] | Cantabria [Member]
Extinguishment of Debt [Line Items]
Interest Rate	1.60%	[4]
Loans Obtained/Assumed	$ 5,918

[1] Represents weighted average interest rate for the loans listed.

[2] Represents interest rate at the time of repayment.

[3] Principal balance on loan assumed approximated fair value at time of acquisition.

[4] Denotes variable rate construction loan.