Real Estate Transactions (Summary Of Income From Properties Sold) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Real Estate Properties [Line Items]    
Total revenues $ 153,715 $ 169,596
Depreciation and amortization (40,802) (44,985)
Income from properties sold 27,008 13,167
Realized gains (losses) on sales, net 144  
Income (loss) from properties sold (2,521) (15,298)
Disposal Group Disposed Of By Means Other Than Sale Not Discontinued Operations [Member]    
Real Estate Properties [Line Items]    
Total revenues 8 14,969
Operating and other expenses (3) (9,253)
Depreciation and amortization (2) (3,394)
Income from properties sold 3 2,322
Realized gains (losses) on sales, net 144  
Income (loss) from properties sold $ 147 $ 2,322