Annual report pursuant to Section 13 and 15(d)

Recent Transactions (Impairments On Properties Held And Used) (Narrative) (Details)

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Recent Transactions (Impairments On Properties Held And Used) (Narrative) (Details)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
property
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2016
USD ($)
Real Estate Properties [Line Items]            
Mortgage loan   $ 726,611   $ 726,611   $ 888,585
Impairments   33,743 [1] $ 164,176 [1] 197,919 $ 25,200  
Investment in property   3,343,236   3,343,236   $ 3,472,794
Mortgage loans, carrying amount   $ 59,700   $ 59,700    
Non-core Properties [Member]            
Real Estate Properties [Line Items]            
Number of impaired properties reduced to carrying value | property 25          
Estimated fair value $ 438,600   438,600      
Aggregate carrying value $ 602,800   $ 602,800      
Number of impaired properties | property 3          
Impairments $ 164,200          
[1] Amounts for the year ended December 31, 2015 relate to impairment charges as further described in Note 3: Recent Transactions - Impairments on Properties Held and Used.