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Investments in real estate, net Sales of real estate assets and related impairment charges (Details)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2015
USD ($)
property
Dec. 31, 2014
USD ($)
ft²
Sep. 30, 2015
USD ($)
ft²
Mar. 31, 2015
USD ($)
ft²
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
ft²
Sep. 30, 2014
USD ($)
Dispositions [Line Items]              
Proceeds from sale of properties           $ 92,455 $ 28,378
Area of Real Estate Property | ft²     19,943,739     19,943,739  
Impairment of real estate   $ 16,600 $ 0   $ 0 $ 14,510 0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax     $ 0   $ 199 $ (9,236) $ 199
CANADA              
Dispositions [Line Items]              
Foreign currency translation losses   $ 5,000          
INDIA              
Dispositions [Line Items]              
Proceeds from sale of properties       $ 12,400      
Impairment of real estate       14,500      
Foreign currency translation losses       4,200      
Development [Member] | INDIA              
Dispositions [Line Items]              
Area of Real Estate Property | ft²   175,000          
Land and Land Improvements [Member] | CANADA              
Dispositions [Line Items]              
Proceeds from sale of properties       54,100      
Income-producing assets [Member] | PENNSYLVANIA              
Dispositions [Line Items]              
Proceeds from sale of properties       $ 1,900      
Area of Real Estate Property | ft²       21,859      
270 Third Street [Member]              
Dispositions [Line Items]              
Number of units in real estate property | property 91            
Sales price $ 43,000            
Proceeds from sale of properties 25,500            
Contractual Obligation $ (17,500)