Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Using Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis
Available-for-sale real estate equity securities	$ 135,460	$ 234,760
Real estate related bonds	0	0
Total assets	135,460	234,760
Derivative interest rate instruments	0	0
Total liabilities	0	0
Using Significant Other Observable Inputs (Level 2) [Member]
Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis
Available-for-sale real estate equity securities	0	0
Real estate related bonds	3,698	8,059
Total assets	3,698	8,059
Derivative interest rate instruments	(1,089)	(458)
Total liabilities	(1,089)	(458)
Using Significant Other Unobservable Inputs (Level 3) [Member]
Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis
Available-for-sale real estate equity securities	0	0
Real estate related bonds	0	0
Total assets	0	0
Derivative interest rate instruments	0	0
Total liabilities	0	0
Interest Rate Swap [Member] | Using Significant Other Observable Inputs (Level 2) [Member]
Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis
Derivative, Notional Amount	$ 51,283	$ 60,044