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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
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Common shares issued	898us-gaap_StockIssuedDuringPeriodSharesNewIssues	555us-gaap_StockIssuedDuringPeriodSharesNewIssues	11,192us-gaap_StockIssuedDuringPeriodSharesNewIssues
Common share options exercised	375,316us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised	183,871us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised	468,839us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Conversions and redemptions of operating partnership units	1us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits	2us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits	558us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits
Cash distributions declared to equity holders per share	$ 2.64us-gaap_CommonStockDividendsPerShareDeclared	$ 2.52us-gaap_CommonStockDividendsPerShareDeclared	$ 2.24us-gaap_CommonStockDividendsPerShareDeclared
Additional Paid-In Capital
Common share options exercised	55us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	0us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	0us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember

X

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

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The number of shares issued during the period upon the conversion of units. An example of a convertible unit is an umbrella partnership real estate investment trust unit (UPREIT unit).

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