Debt (US Union Square Construction Financing) (Narrative) (Details) $ in Thousands		12 Months Ended
	Jun. 02, 2015 USD ($)	Dec. 31, 2016 USD ($)		Dec. 31, 2015 USD ($)	Dec. 29, 2016 loan
Debt Instrument [Line Items]
Contractual facility		$ 266,233		$ 207,075
US Union Square Line Of Credit [Member]
Debt Instrument [Line Items]
Contractual facility	$ 8,000	57,500	[1]
Advanced to Date		8,000
Facility Limit		57,500
US Union Square Line Of Credit [Member] | Bank Of The Ozarks [Member]
Debt Instrument [Line Items]
Contractual facility		50,000
Number of loan tranches | loan					3
US Union Square Line Of Credit [Member] | Bank Of The Ozarks [Member] | Senior Loan [Member]
Debt Instrument [Line Items]
Advanced to Date		8,000
Facility Limit		8,000
US Union Square Line Of Credit [Member] | Tammany Mezz Investor, LLC [Member] | Mezzanine Loan [Member]
Debt Instrument [Line Items]
Contractual facility		7,500
Facility Limit		$ 7,500

[1] In December 2016, we successfully negotiated the construction financing for our Union Square redevelopment project, $8.0 million of which was advanced from the total construction loan limit of $57.5 million to repay the existing line of credit with East West Bank, which was originally scheduled to mature on July 2, 2017. Refer below for further discussions on this construction financing.