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Mortgage Loans Payable And Unsecured Credit Facilities (Effect Of The Derivative Financial Instruments On The Consolidated Statements Of Operations And Consolidated Statements Of Equity) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net amount of (gain) loss recognized in other comprehensive income reclassified into earnings (effective portion) | $ 28,272,000 | $ 32,301,000 | $ 34,762,000
Interest Rate Swap [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net amount of gain (loss) recognized in other comprehensive income (effective portion) | (4,539,000) | (3,650,000) | 202,000
Continuing Operations [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net amount of (gain) loss recognized in other comprehensive income reclassified into earnings (effective portion) | $ 3,621,000 | 1,663,000 | 749,000
Discontinued Operations [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net amount of (gain) loss recognized in other comprehensive income reclassified into earnings (effective portion) |  | $ 129,000 | $ 309,000

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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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