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Subsequent Events (Schedule of Dividends Declared and Distributions per Unit) (Details)
0 Months Ended 6 Months Ended 0 Months Ended
Jul. 26, 2011
USD ($)
Jul. 26, 2011
GBP (£)
Jul. 21, 2011
USD ($)
A
Jul. 21, 2011
AUD
Jun. 30, 2011
USD ($)
Jun. 30, 2010
USD ($)
Jul. 25, 2011
Series C Preferred Unit Subsequent Dividends [Member]
USD ($)
Jul. 25, 2011
Series D Preferred Unit Subsequent Dividends [Member]
USD ($)
Jul. 25, 2011
Common Stock And Common Unit Subsequent Dividends [Member]
USD ($)
Jul. 25, 2011
Prudential Shelf Facility [Member]
USD ($)
Repurchase of debenture price percentage         100.00%          
Acres acquired from real estate purchase     8.6 8.6            
Acquisitions of properties $ 21,200,000 £ 12,900,000 $ 11,000,000 10,100,000 $ 17,523,000 $ 405,983,000        
Repayments of 7.0% Series A unsecured notes                   $ 25,000,000
Debt instrument, interest rate, stated percentage                   7.00%
Dividend and distribution amount             $ 0.273438 $ 0.343750 $ 0.680000  
Dividend and distribution payable date Sep. 30, 2011 Sep. 30, 2011 Sep. 30, 2011
Dividend payable to shareholders of record on Sep. 15, 2011 Sep. 15, 2011 Sep. 15, 2011
Annual equivalent rate of dividend and distribution             $ 1.094 $ 1.375 $ 2.720