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Real Estate Properties (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Y
Dec. 31, 2010
Balance Sheets:    
Real estate properties $ 7,244,232 $ 6,357,258
Acquired real estate leases 343,917 233,913
Rents receivable 217,592 191,237
Other assets, net 197,346 171,380
Properties held for sale   114,426
Assumed real estate lease obligations 70,179 65,940
Rent collected in advance 37,653 27,988
Security deposits 23,779 22,523
Liabilities related to properties held for sale   1,492
Real estate properties held for sale
   
Real estate properties information    
Probable selling period of property to be classified as held-for-sale (in years) 1  
Balance Sheets:    
Real estate properties   105,291
Acquired real estate leases   1,104
Rents receivable   4,446
Other assets, net   3,585
Properties held for sale   114,426
Assumed real estate lease obligations   7
Rent collected in advance   1,187
Security deposits   298
Liabilities related to properties held for sale   $ 1,492