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Consolidated Statements Of Equity And Perpetual Preferred Units Consolidated Statements Of Equity and Perpetual Preferred Units (Parentheticals) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Common shares issued | 898 us-gaap_StockIssuedDuringPeriodSharesNewIssues | 555 us-gaap_StockIssuedDuringPeriodSharesNewIssues | 11,192 us-gaap_StockIssuedDuringPeriodSharesNewIssues
Common share options exercised | 375,316 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | 183,871 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | 468,839 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Conversions and redemptions of operating partnership units | 1 us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits | 2 us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits | 558 us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits
Cash distributions declared to equity holders per share | $ 2.64 us-gaap_CommonStockDividendsPerShareDeclared | $ 2.52 us-gaap_CommonStockDividendsPerShareDeclared | $ 2.24 us-gaap_CommonStockDividendsPerShareDeclared
Additional Paid-In Capital |  |  |
Common share options exercised | 55 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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