Debt (Mortgage Notes Payable) (Narrative) (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Mar. 06, 2015 USD ($) property	Dec. 31, 2014 USD ($)
Debt Instrument [Line Items]
(Loss) gain on extinguishment and forgiveness of debt, net	$ (2,003)	$ 0	$ (1,751)	$ 5,302
Mortgage Notes Payable [Member]
Debt Instrument [Line Items]
Mortgage notes in connection with default from non-recourse loan					$ 38,100	$ 53,800
Gain (loss) on forgiveness of debt			(3,400)	$ 4,900
Number of non-recourse loan secured properties | property					2
(Loss) gain on extinguishment and forgiveness of debt, net			(600)
Mortgage Notes Payable [Member] | Foreclosure [Member]
Debt Instrument [Line Items]
(Loss) gain on extinguishment and forgiveness of debt, net			$ 19,100