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Summary of Significant Accounting Policies - Narrative (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Jun. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Jun. 30, 2014
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
property
Property, Plant and Equipment [Line Items]            
Foreign Currency Transaction Gain (Loss), before Tax       $ 8,857,000 $ 0 $ 0
Percentage of investments in subsidiaries       100.00%    
Loss on asset impairment   $ 167,100,000 $ 22,700,000 $ 17,162,000 185,067,000 124,253,000
Loss on asset impairment in discontinuing operations           $ 79,800,000
Number of properties impaired | property           39
Number of buildings impaired | property           93
Losses on asset impairment for properties sold           $ 23,100,000
Accrued environmental remediation costs   500,000     $ 500,000  
Minimum percentage of likelihood of realization of tax benefits         50.00%  
Foreign currency translation adjustments   $ (48,900,000)   0 $ (48,900,000)  
Total amounts reclassified       $ (65,051,000)    
Maximum            
Property, Plant and Equipment [Line Items]            
Maximum percentage of investment accounted for under equity method of accounting       50.00%    
Maximum | Buildings and improvements            
Property, Plant and Equipment [Line Items]            
Maximum estimated useful life       40 years    
Maximum | Personal property            
Property, Plant and Equipment [Line Items]            
Maximum estimated useful life       12 years    
Foreign Currency Translation Adjustments            
Property, Plant and Equipment [Line Items]            
Total amounts reclassified       $ (63,207,000)    
Foreign Currency Translation Adjustments | Australia Portfolio            
Property, Plant and Equipment [Line Items]            
Total amounts reclassified $ 63,200,000