Dispositions (Details) $ in Thousands	1 Months Ended	3 Months Ended
	Jan. 31, 2017 USD ($)	Mar. 31, 2017 USD ($) outparcel	Sep. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on impairment		$ 3,263		$ 19,685
Gain on extinguishment of debt		4,055		6
Gain on sales of real estate assets		5,988		0
One and Two Oyster Point
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales Price, Gross	$ 6,250
Sales Price, Net	6,142
Gain	0
Loss on impairment			$ 3,844
Midland Mall
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on impairment				4,681
Balance of Non-recourse Debt	31,953
Gain on extinguishment of debt	$ 4,055
Non-cash default interest expense				$ 479
Outparcel Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sales of real estate assets		$ 5,988
Number of properties disposed of | outparcel		5