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Debt (Amended, Restated And Consolidated Credit Facility) (Details) (USD $)
 1 Months Ended 9 Months Ended
Oct. 31, 2012
Sep. 30, 2012
Line of Credit Facility [Line Items]    
Lender fees, closing and transaction costs   $ 4,000,000
Write-off of unamortized fees   2,607,000
Basis spread on borrowings variable rate   275.00%
Weighted-average interest rate   3.00%
Additional borrowing capacity under accordion feature   500,000,000
Revolving credit facility, amount outstanding   18,000,000
Remaining borrowing capacity   164,900,000
Revolving Credit Facility [Member]
    
Line of Credit Facility [Line Items]    
Credit facility borrowing capacity   225,000,000
Term Loan [Member]
    
Line of Credit Facility [Line Items]    
Credit facility borrowing capacity   75,000,000
Minimum [Member]
    
Line of Credit Facility [Line Items]    
Basis spread on borrowings variable rate   200.00%
Maximum [Member]
    
Line of Credit Facility [Line Items]    
Basis spread on borrowings variable rate   300.00%
New [Member]
    
Line of Credit Facility [Line Items]    
Credit facility borrowing capacity   300,000,000
Prior [Member] | Revolving Credit Facility [Member]
    
Line of Credit Facility [Line Items]    
Credit facility borrowing capacity   185,000,000
Prior [Member] | Development Porperty Credit Facility [Member]
    
Line of Credit Facility [Line Items]    
Credit facility borrowing capacity   150,000,000
Series B [Member]
    
Line of Credit Facility [Line Items]    
Redeemable preferred stock, shares sold   4,800,000
Series A [Member]
    
Line of Credit Facility [Line Items]    
Shares of Redeemable Preferred Stock redeemed and purchased 4,500,000 487,000
Total cash outlay for Redeemable Preferred Stock shares redeemed and purchased $ 114,100,000 $ 12,400,000