Mortgage Loans Payable And Credit Facility (Effect Of The Derivative Financial Instruments On The Consolidated Statements Of Operations And Consolidated Statements Of Equity) (Details) - USD ($)	3 Months Ended	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Designation/Cash Flow [Member] \| Interest Rate Swap [Member]
Derivative Instruments Gain Loss [Line Items]
Net amount of Gain (loss) recognized in other comprehensive income (effective portion)	$ (1,678,000)	$ (5,504,000)	$ (1,204,000)	$ (11,396,000)
Continuing Operations [Member]
Derivative Instruments Gain Loss [Line Items]
Net amount of (Loss) recognized in other comprehensive income reclassified into earnings (effective portion)	$ (650,000)	$ (908,000)	$ (1,516,000)	$ (1,830,000)

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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- Definition

The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4D
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624177-113959

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- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ References

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