Fair Value Measurements (Narratives) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Impairment charges	$ 1,023	$ 570	$ 0
Deferred acquisition fees payable
Fair Value Inputs
Leverage adjusted unsecured spread	2.03%
Illiquidity Adjustment	0.75%
Equity investments in real estate
Fair Value Inputs
Cash flows discount rate		11.75%	6.00%
Discount rate		10.50%	6.25%
Cap rate		9.50%	5.75%
Nonrecurring | Level 3
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Impairment charges	$ 1,023	$ 1,336	$ 3,778
Nonrecurring | Equity investments in real estate | Level 3
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Impairment charges	$ 0	$ 766	$ 3,778