Supplemental Detail for Certain Components of Consolidated Balance Sheets (Details 2) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Other assets, net    
Deferred financing costs, net $ 22,295 $ 23,274
Restricted escrow deposits 18,300 36,540
Notes receivable issued in connection with property sales 18,243 18,342
Prepaid expenses 15,166 14,137
Impounds related to mortgages payable 4,868 5,789
Corporate assets, net 2,492 2,600
Other items 2,954 2,797
Total other assets 87,721 107,650
Credit Facility    
Other assets, net    
Credit facility origination costs, net $ 3,403 $ 4,171