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Mortgage Notes Payable (Narrative) (Details)
6 Months Ended
Jun. 30, 2016
USD ($)
property
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Aug. 30, 2015
USD ($)
Debt Instrument [Line Items]        
Restricted cash $ 7,889,000   $ 7,887,000  
Restricted cash released (2,000) $ 0    
Mortgage notes payable and premiums, net        
Debt Instrument [Line Items]        
Collateral pledged $ 2,000,000,000   2,000,000,000  
Encumbered Properties | property 451      
Outstanding Loan Amount $ 1,039,759,000   1,053,648,000  
Mortgage notes payable and premiums, net | Multi-Tenant Mortgage Loan        
Debt Instrument [Line Items]        
Face amount       $ 655,000,000
Interest rate       4.30%
Encumbered Properties | property 268      
Outstanding Loan Amount $ 649,532,000   $ 649,532,000  
Restricted cash 7,900,000     $ 42,500,000
Restricted cash released $ 34,600,000