Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ in Thousands				3 Months Ended					12 Months Ended
	Dec. 28, 2017	May 12, 2016	Jan. 13, 2016	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Jun. 28, 2017	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Early extinguishment of debt				$ 12,300					$ (12,273)	$ 0	$ (19,072)
Coconut Grove | CocoWalk
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of real estate, net of noncontrolling interests		$ 500
gain on sale of real estate | Santana Row
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Reversal of warranty reserve					$ 4,900					$ 4,900
Clarion
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on acquisition of controlling interest			$ 25,700					$ 25,700
Land | Assembly Row
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (Loss) on Sale of Properties							$ 15,400
Gain on sale of real estate						$ 15,400
Land | 150 Post Street And North Lake Commons
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of real estate					50,800
Land | Bethesda Row
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (Loss) on Sale of Properties	$ 6,500
Condominiums | Assembly Row
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of real estate				$ 1,500	$ 600	$ 3,300			$ 5,400