Borrowings (Narrative) (Details) (USD $)			9 Months Ended		0 Months Ended		9 Months Ended			9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2012 Mortgage Notes Payable [Member]	Sep. 30, 2012 Fixed Rate Mortgage Loans [Member]	Jan. 23, 2012 7.84% Senior Notes, Due 1/23/12 [Member]	Sep. 30, 2012 7.84% Senior Notes, Due 1/23/12 [Member]	Sep. 30, 2012 Unsecured Revolving Credit Facilities [Member]	Dec. 31, 2011 Unsecured Revolving Credit Facilities [Member]	Sep. 30, 2012 Unsecured Revolving Credit Facilities [Member] City National Bank of Florida [Member]	Sep. 30, 2012 Term Loan And Interest Rate Swaps [Member]	Sep. 30, 2012 Term Loan And Interest Rate Swaps [Member] First Draw [Member]	Sep. 30, 2012 Term Loan And Interest Rate Swaps [Member] Minimum [Member]	Sep. 30, 2012 Term Loan And Interest Rate Swaps [Member] Maximum [Member]	Jul. 12, 2012 Term Loan [Member]	Sep. 30, 2012 Term Loan [Member] First Draw [Member]	Feb. 13, 2012 Term Loan [Member] First Draw [Member]	Jul. 12, 2012 Term Loan [Member] Second Draw [Member]
Debt Instrument [Line Items]
Mortgage loans prepaid without penalty, Amount			$ 37,700,000
Mortgage loans prepaid without penalty, weighted-average interest rate			6.80%
Repayments of unsecured debt					10,000,000
Debt instrument, interest rate, stated percentage					7.84%
Weighted average interest rate of at period end				6.09%		6.03%
Maximum amount under lines of credit							575,000,000		15,000,000
Unsecured revolving credit facilities	62,000,000	138,000,000
Drawings against amended facility, Amount								138,000,000
Drawings against amended facility, Percentage							1.77%	1.85%
Facility fee							0.30%
Availability under credit facility							386,700,000
Term loan	250,000,000													250,000,000	200,000,000	200,000,000
Term loan expiration date										Feb. 13, 2019
Margin, percentage above LIBOR									1.55%	1.90%		1.50%	2.35%
Line of credit facility, interest rate during period											3.46%
Derivative, Fixed Interest Rate																	3.00%
Derivative, Amount of Hedged Item																	50,000,000
Derivative Liability, Fair Value, Gross Asset										$ 7,700,000