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Debt (Amended, Restated And Consolidated Credit Facility) (Details) (USD $)
 6 Months Ended
Jun. 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
Weighted-average interest rate 3.00%
Additional borrowing capacity under accordion feature 500,000,000
Revolving credit facility, amount outstanding 104,500,000
Remaining borrowing capacity 78,300,000
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