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Subsequent Events: (Details) (USD $)
1 Months Ended
Mar. 31, 2010
Dec. 31, 2009
Sep. 30, 2009
Jun. 30, 2009
Mar. 31, 2012
Dividend declared
Feb. 22, 2012
Dividend declared
Subsequent events            
Dividend/distribution for common stockholders and OP Unit holders (in dollars per share)           $ 0.55
Percentage of dividend/distribution payable in cash (in percentage) 10.00% 10.00% 10.00% 10.00% 100.00%